282 Journal New York Extomological Society. [^'°'- xxii. 



stages. Professor Johannsen describes the larva and pupa of this 

 species in Bulletin 86 (1905) of the New York State Museum, p. 102, 

 and the writer has also succeeded in rearing the species. 



Descriptions of three species are given in this paper, the types 

 being deposited in the collection of the Illinois State Laboratory of 

 Natural History. The species taken by the writer have all been 

 either swept from vegetation near streams, or taken on windows, or 

 at rest on houses, etc., in similar situations. 



This paper is published by permission of Dr. S. A. Forbes, State 

 Entomologist of Illinois. 



Synopsis of Species. 



1. \\'ing with two black spots punctipeunis \\'illiston. 



Wing unspotted z 



2. Only the fore femora with spines 3 



At least fore and hind femora spinosc 10 



3. Halteres black 4 



Halteres pale, rarely brownish 5 



4. Claws simple veuustula Williston. 



Claws with central tooth flaz'itarsis n. sp. 



5. Fifth hind tarsal joint with ventral spines 6 



Fifth joint of hind tarsus unspined 7 



6. Third vein extending six sevenths of the wing length ; fourth vein forking 



slightly before the cross vein setipes Coquillett.* 



Third vein extending three fourths of the wing length ; fourth vein fork- 

 ing considerably beyond the cross vein expoUta Coquillett. 



7. Hind tibiae with distinct bristles media Coquillett. 



Hind tihise without distinct bristles 8 



8. Abdomen black pniinosa Coquillett. 



Abdomen in part pale yellow 9 



9. .Abdomen pale yellow, dorsum of first segment brown. .Z'aricolor Coquillett. 

 Abdomen pale yellow, apical half blackened apicata n. sp. 



10. All femora with one spine barbcri Coquillett. 



Femora otherwise than above 11 



1 1. Only fore and hind femora spiucd 12 



All femora with spines 13 



12. Last tarsal joint spinose ventrally ; halteres yellow setipes Coquillett. 



Last tarsal joint without spines ; halteres black dcntata n. sp. 



13. All femora spinose on almost their entire length johusoni Coquillett. 



Femoral spines confined to apical half 14 



14. Halteres white; abdomen white, fuscous-tinged; hind tibia; spinose. 



selulosa Loew. 

 1 See also section 11. 



