360 



Length, nearly i mm. 



Described from a single female, taken at Hot Springs. Yavapai 

 County. Arizona. 



The species is not recorded for Illinois. 



Addexdum to Ceratopogoxix.£ 



Since writing the part of this paper dealing with the genus Hete- 

 romyia I have seen a specimen of pratti Coquillet from \Msconsin, 

 which has caused me to reconsider the desirability of presenting a 

 s\'nopsis oi the species with maculate wings. It is not improbable that 

 some of the four species occur in Illinois, and the key given below will 

 serve to identify them. 



SUPPLEMEXTART KEY TO SPECTES OF HETEROMYIA 



1. Wings with. 3 equidistant faseis 1. fasciata. 



— "Wings with spots or with irregular black marks, not fasciate 2 



2. Thorax reddish, with 3 black vittte; abdomen of female with shin- 



ing white pniinescence : wings with 4 black spots. Small species, 

 about 2.5 mm. in length 2. fesfiva. 



— Thorax brownish yellow or blackish, without vittse : abdomen of fe- 



male without white pruiuescenee : wings with 2 black spots, the 

 outer one large and irregular in form. Larger species. 4 mm. in 

 length 3 



3. Mid and hind tibis with two brown, rings before their tips 



3. cJavata. 



— ^lid and hind tibiae with the exception of their apices blackish 



brown 4. pratti. 



I. Heteromyia fasciata Say 



Heteromyia fasciata Sav, Amer. Enr.. Vol. 2. p. SO. lS2o. 



This species is the type of the genus. It was originally described 

 by Say without any locality being designated for it. Subsequently it 

 was recorded for the Atlantic States by Osten Sacken. and for Xew 

 Jersey by Smith. 



The species which have unspotted wings have the claws of the pos- 

 terior tarsi subequal. whereas those with spotted wings have, at least 

 in the females, one claw ver}- much longer than the other, so much so 

 that they have sometimes been described as possessing but a single 

 claw on the hind tarsi. Without a larger amount of material, repre- 

 senting both sexes of the latter group. I can not decide whether the 

 groups should rank as distinct genera. 



