No. 3.] HYGROCELEUTHUS AND DOLICHOPUS. 



12 



We have examined types of all the species except latipes, 

 plumipes, crcnatus, afflictus, and ciliatus. The specimens 

 studied in the preparation of this paper are in the collection 

 of Dr. Wm. M. Wheeler, who kindly placed his collection at 



our disposal. 



Although the name ciliatus has been previously used by 

 Walker,! Aldrich's ciliaUis may remain, as Walker's species is 

 too poorly characterized to admit of its recognition. 



Males. 



A Idrich ii W h eeler 



3 

 latipes Loew 

 laterally . . 4 

 Wheelerii, sp. nov. 

 . plumipes Scop. 

 6 



Middle tarsi ornamented 



Middle tarsi plain 



2. Antennae largely black .... 

 First joint of antennae yellow 



3. Middle tarsi strongly compressed . 

 Middle tarsi not compressed, first joint feathered 



4. Middle tibia twice length of femur 

 Middle tibia not elongated, slender 



5. Cilia of tegulae yellow 



Cilia of tegulae mostly black . . • ■ 



6. Second abdominal segment laterally with a tuft of yellow hairs 



afflictus O. S. 



Abdomen without such tuft 



7. Face yellowish white . 

 Face silvery 



8. Arista bare . 

 Arista densely pubescent 



9. Front coxae yellow, postocular cilia in part yellow 



consanguitieus Wheeler 



Coxae black, postocular cilia wholly black . . var. propinquus 



. crenatus O. S. 



idahoensis Aldrich 



ciliatus Aldrich 



9 



Females. 



First joint of antennae yellow . . • . • 



First joint of antennae in great part black 4 



2 Species about 6 mm. first joint of middle tarsus yellow at base . 3 

 Species about 4 mm. Middle tarsi wholly black . . plumipes Scop. 



3 Hind tibiae wholly yellow, vertex green ... • latipes Loew 

 Hind tibiae black at tip, vertex violet . . • latipes var. cognatus 



4. Tip of hind tibiae black, or, if yellow, the wings narrow . . 5 



Hind tibiae wholly yellow . • • • 



1 List ofDipUra in Collection of British Museum, pt. iii, p- 661. 



