THE FLIES THAT CAUSE MYIASIS IX MAN 



121 



6. Mouth hooks toothed ventrally Hylemya Robineau-Desvoidy 



Mouth hooks not toothed ventrally 7 



7. Slits of posterior spiracles distinctly arcuate (fig. 77) 



.1/ uscina Robineau-Desvoidy 

 Slits of posterior spiracles nearly straight (fig. 73 > 



Peronia Robineau-Desvoidy 

 Hydrotaea Robineau-Desvoidy 



The Genus ANTHOMYIA Meigen 



Members of this genus are grayish or ash-colored flies with promi- 

 nent velvety black markings on the thorax and abdomen. The eyes 



are bare; the proboscis is robust 

 but of ordinary length: the pro- 

 pleura are distinctly haired; the 

 presternum, pteropleura. and hy- 

 popleura are bare. Vein r 4+5 is 

 straight and the apical cell 

 broadly open; the anal vein is 

 continued to the wing margin as 

 a slight but readily distinguish- 

 able fold. The scutellum bears 

 a number of fine, pale hairs on 

 its under surface. 



Keilin (67) has published an 

 account of the biology and immature stages of two species. A. pluvial is 

 (Linnaeus) and A. procettaris Rondani. 



Larva. — In the two species in which the larva is known, it is of the 

 ordinary muscoid type. The anterior end bears a series of sclerotized 

 ridges on each side of the buccal opening, which spread out fanlike, 

 fork, and then break up into isolated scalelike structures as they 

 approach the dorsal side. Complete rings of small hooks are present 

 on the anterior margin of each segment and on the posterior margin as 

 well as on each abdominal segment. The posterior end is truncated 

 and bears eight pairs of conical processes, each with a small sensory pit. 



Figure 65. — Anthomyia pluvialis, pos- 

 terior spiracles of puparium. 



ANTHOMYIA PLUVIALIS (Linnaeus) 



Synonymy. — Some authors consider Anthomyia procettaris Rondani a synonym 

 of this species; others consider the two species distinct, though closely related. 



Recognition Characters. — Adult : The pubescence of the arista is shorter 

 than its basal diameter; the costal spine of the wing is but feebly developed: 

 the thorax is grayish, with two black spots before and three behind the suture; 

 the scutellum is black on each side at the base, but the pale gray central stripe 

 is broad and extends from the base to the apex. Length about 5 mm. Larva : 

 What Keilin considers as probably the larva of this species does not differ 

 significantly from that of A. procettaris ( rig. 65, ef. fig. <'»''< I . 



Geographical Distribution. — Nearctic Region : Quebec, Ontario, British Co- 

 lumbia. Maine, New Hampshire, Vermont. Massachusetts. Rhode Island. Connect- 

 icut, New York, New Jersey. Pennsylvania, Maryland. District of Columbia, 

 Virginia, North Carolina, Indiana, Illinois. Louisiana, Montana. Idaho, New- 

 Mexico, California. Neotropical Region : Mexico. Palaearctic Region : Scotland, 

 England, Portugal, Spain, France. Netherlands. Italy, Capri. Corsica. Sardinia. 

 Sicily, Malta, Norway. Sweden. Finland, Lapland (Swedish), Denmark. Germany, 

 Austria, Hungary, Rumania, Crete. European Russia (widespread). Azores, 

 Canary Islands, Madeira, Morocco, Algeria, Tunisia, Dodecanese, Cyprus. Syria. 

 Palestine, Iran, Russian Turkestan, Irkutsk, China, Japan. Oriental Region : 

 India. 



