45 Insects described in 1903

Agapostemon coloradinus, the Colorado striped-sweat bee, is a species of sweat bee in the family Halictidae.

Ameles taurica is a species of praying mantis found in Ukraine.

The Milwaukee miner bee is a species of miner bee in the family Andrenidae. Another common name for this species is the Milwaukee andrena. It is found in North America.

Andrena semilaevis is a Palearctic species of mining bee.

Atomosia sayii is a species of robber flies in the family Asilidae.

Bombus auricomus is a species of bumblebee known by the common name black and gold bumblebee. It is native to eastern North America, including Ontario and Saskatchewan in Canada and much of the eastern United States, as far west as the Great Plains.

Camponotus texanus is a species of ant in the family Formicidae.

Camptoprosopella dolorosa is a species of fly in the family Lauxaniidae.

Ceratophyllus rusticus is a species of flea in the family Ceratophyllidae. It was described by Wagner in 1903.

Coenosia attenuata, commonly called "hunter fly" or well known under the name "killer fly", is a predatory fly belonging to the family Muscidae.

Diapheromera arizonensis, the Arizona walkingstick, is a species of walkingstick in the family Diapheromeridae. It is found in North America.

Ectopsocus californicus is a species of outer barklouse in the family Ectopsocidae. It is found in Australia, Central America, and North America.

Enallagma daeckii, the attenuated bluet, is a species of narrow-winged damselfly in the family Coenagrionidae. It is found in North America.

Eublaberus distanti, known as the six-spotted, four-spotted, four-spot, or Trinidad bat-cave roach or cockroach, is a primarily cave-dwelling Central and South American cockroach of the genus Eublaberus.

Eucorethra underwoodi is a species of phantom midges.

Eusynthemis is a genus of dragonflies in the family Synthemistidae. They are commonly known as tigertails. Species of this genus are found mostly in Australia with one species, Eusynthemis frontalis, found in the Solomon Islands.

Formica densiventris is a species of ant in the family Formicidae.

Formica neogagates is a species of ant in the family Formicidae. Found throughout North America and Canada, introduced in Europe, France.

Formica oreas is a species of ant in the family Formicidae.

Halictus hotoni, the emerald furrow bee, is a species of sweat bee in the family Halictidae native to southern Africa and introduced to Australia. It was described by Joseph Vachal in 1903.

Ischnura barberi, the desert forktail, is a species of narrow-winged damselfly in the family Coenagrionidae. It is found in North America.

Lasioglossum cupromicans is a Palearctic species of sweat bee.

Lasioglossum fratellum is a Palearctic species of sweat bee.

Lasius subumbratus is a species of ant in the family Formicidae.

Megachile campanulae, known as the bellflower resin bee, is a species of bee in the family Megachilidae. Described in 1903, these solitary bees are native to eastern North America. Studies in 2013 placed them among the first insect species to use synthetic materials for making nests. They are considered mason bees, which is a common descriptor of bees in several families, including Megachilidae. Within the genus Megachile, frequently also referred to as leafcutter bees, M. campanulae is a member of the subgenus Chelostomoides, which do not construct nests from cut leaves, but rather from plant resins and other materials. Females lay eggs in nests constructed with individual cell compartments for each egg. Once hatched, the eggs progress through larval stages and subsequently will overwinter as pupae. The bees are susceptible to parasitism from several other bee species, which act as brood parasites. They are medium-sized bees and the female adults are typically larger than the males. They are important pollinators of numerous native plant species throughout their range.

Myrmica schencki is a species of ant in the genus Myrmica.

Nemotelus kansensis is a species of soldier fly in the family Stratiomyidae.

Neohermes concolor is a species of fishfly in the family Corydalidae. It is found in North America.

Neophylax fuscus is a species of caddisfly in the family Thremmatidae. It is found in North America.

Nomada sphaerogaster is a rare species of nomad bee in the family Apidae. It is found in North America.

Nomada vegana is a species of nomad bee in the family Apidae. It is found in Central America and North America.

The Oriental rat flea, also known as the tropical rat flea, is a parasite of rodents, primarily of the genus Rattus, and is a primary vector for bubonic plague and murine typhus. This occurs when a flea that has fed on an infected rodent bites a human, although this flea can live on any warm blooded mammal.

Paraphlepsius collitus is a species of leafhopper in the family Cicadellidae.

The petaltails of the family Petaluridae are apparently the most ancient of the extant true dragonflies, having fossil members from as early as the Jurassic.

Pheidole inquilina is a species of ant in the genus Pheidole. It is endemic to the United States.

Plebeia droryana is a species of stingless bee that is in the family Apidae and tribe Meliponini. Bees of the species are normally found in a few states in southern Brazil and their nests can be found in tree cavities. Depending on the region, P. remota may have a different morphology and exhibit different behaviors. The bee's diet consists of nectar and pollen that are collected intensely from a few sources. Researchers have conducted a multitude of studies analyzing the changes that occur in the colony during reproductive diapause and what happens during the Provisioning and Oviposition Process or POP.

Plebeia remota is a species of stingless bee that is in the family Apidae and tribe Meliponini. Bees of the species are normally found in a few states in southern Brazil and their nests can be found in tree cavities. Depending on the region, P. remota may have a different morphology and exhibit different behaviors. The bee's diet consists of nectar and pollen that are collected intensely from a few sources. Researchers have conducted a multitude of studies analyzing the changes that occur in the colony during reproductive diapause and what happens during the provisioning and oviposition process or POP.

Protoneura cara, the orange-striped threadtail, is a species of narrow-winged damselfly in the family Coenagrionidae. It is found in Central America and North America.

Ptilothrix relata is a species of chimney bee in the family Apidae. It is found in South America.

Somatochlora provocans, the treetop emerald, is a species of emerald dragonfly in the family Corduliidae. It is found in North America.

Sphex nudus, the katydid wasp, is a species of thread-waisted wasp in the family Sphecidae.

Stenamma schmitti is a species of ant in the family Formicidae.

Sympherobius barberi, or Barber's brown lacewing, is a species of brown lacewing in the family Hemerobiidae. It is found in Europe & Northern Asia, Central America, North America, Oceania, and South America.

Trachymyrmex turrifex, the fungus farming ant, is a species of higher myrmicine in the family Formicidae.

Triepeolus simplex, the cuckoo bee, is a species of cuckoo bee in the family Apidae. It is found in North America.