325 



The species of this genus which have spots or bands upon the wings 

 are fasciata Say, clavata Williston, fcstira Loew, d.m\pratti Coquillett.* 

 I have taken none of these species in IlHnois. 



Key to Species 



1. Halteres pale yellow 2 



— Halteres black or brown 4 



2. Yellow species 1. rufa. 



— Black species 3 



3. Apices of mid and hind femora, bases of mid tibiae, and whole of 



hind pair blackened ; fore femora slightly thickened and with 3 — 

 4 spines 2. aldriclii. 



— Legs entirely yellow ; fore femora much thickened and with 16 or 



more spines 3. pleheia. 



4. Legs almost entirely yellow 5 



— Mid and hind legs conspicuously blackened 6 



5. Fifth tarsal joint Avith ventral spines; scape of antenna yellow. . . . 



4. cressoni. 



— Fifth tarsal joint without ventral spines; scape of antennae black. . 



5. tenuicornis. 



6. Scape of antenna yellow ; claws of hind tarsi very distinctly longer 



than those of fore and mid pairs 6. trivialis. 



— Scape of antennae black ; claws of hind tarsi not longer than those of 



fore and mid pairs 7 



7. Mesonotum subopaque black 7. opacitlwrax. 



— Mesonotum glossy black .8 



8. Disc of mesonotum with very distinct pale hairs 8. Jiirta. 



— Disc of mesonotum with at most very short hairs, generally bare . . 



9. fiavipes. 



I. Heteromyia rufa Loew 



Ceratopogon rufus Loew, Berl. Ent. Zeitsehr., 18(il, p. 314, pp. 12. 



Palpomyia rufa (Loew) Malloeh, Bull. 111. State Lab. Nat. Hist., Vol. 10, p. 217. 



In my recent revision of the genus Palpoiiiyiaj I suggested the pos- 

 sibility of this species belonging to Heteromyia. At that time I had 

 not seen the species, but subsequently Professor Johannsen sent me an 

 example, with a number of other species, from Ithaca. N. York, and 

 Mr. Cresson sent me another from his collection, taken at Swarth- 

 more, Pa. It may be well to indicate its specific characters here. 



Female. — Reddish yellow, shining. Flagellum of antennae, extreme 

 apices of mid femora, apical third of hind femora, apices of hind tibiae, 

 and last three tarsal joints brownish. 



*For key to these species see "Addendum to Ceratopogoninxr," page 360. 

 tBull. 111. State Lab. Nat. Hist., Vol. 10, Art. 4 (1914), p. 217. 



