96 ENTOMOLOGICAL SOCIETY 



Larva elongate pear-shaped, thicker in front than behind, beset with 

 only a few transverse rows of spurs ; stigmata on the last seg 

 ment in the form of three longitudinally cleft arches of the 

 Gastrophilus type gen. Dermatobia 



Cephenomyia Latrieille, Fam. Natur. (1825). Ga.; N. W. Terr.; Cal. 

 Parasitic in necks of deer. Reported found in hogs in W. Va. (See 

 Insect Life, U. S. Dep. Agr., Ill, 161-162). Also, reported from nose 

 of man (1. c. II, 116). 



Cuterebra Clark, Essay on Bots. (1815.) Syn. Trypoderma Wied. 

 U. S. ; Nova Scotia ; Vancouver ; Mexico ; Guatemala. Rodents. 



Dermatobia Brauer, Verb. Z. b. Ges. (1860.) D. cyaniventris Mcq. 

 is known from Central America. This genus is parasitic on man, dogs. 

 A larva, doubtfully, and probably incorrectly referred to this genus, was 

 reported from Mississippi by Verrill (Insect Life, I, 226). 



Gastrophilus Leach, Gen. sp. Eprob. Ins. (1817.) Syn. Gastrus Meig. 

 Nova Scotia ; N. A. ; Jamaica. Horses. 



Hypoderma Clark, Essay on Bots. (1815.) Nova Scotia ; N. A. Oxen, 

 buffalo, sheep ?, deer, man. (See Insect Life, II, 238-239). 



CEdamagena Latreille, Fam. Natur. (1825.) N. A. Reindeer. 



CEstrus Linne", Fauna Suecica. (1761.) N. A. Sheep. 



Fam. Phasiidae. 



The larvae are parasitic, as far as known, on plant-bugs and 

 beetles. 



1 . Abdomen elongate oval or oblong, often cylindrical in the , beset at 



least toward the extremity with moderately long, generally 



irregularly arranged, bristly hairs 2 



Abdomen shorter, rounded, almost naked or with only fine and short 

 pubescence 3 



2. Hind tibiae lashed or ciliate ; antennae short ; epistoma prominent ; 



apical cell closed ; hind cross-vein doubly arcuate ; abdomen of 



9 cylindrical; claws of (^elongate gen. Trichopoda 



Hind tibiae not ciliate ; apical cell closed (in our species) ; antennae 

 short, third joint somewhat elongate ; front not produced, epi 

 stoma prominent ; hind cross-vein curved ; abdomen swollen ; 

 claws strong, nearly alike in both sexes gen. Xysta 



3. Apical cell open ; abdomen broader than the thorax ; wings very wide, 



almost triangular ; fourth longitudinal vein bent at an angle ; 

 hind cross-vein twice curved ; third antennal joint not longer 

 than the first and second together, the arista distinctly 3-jointed. 



gen. Phasia 



