622 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



Abdomen oval, hypopygium comparatively small; wings short, apical 

 cell not so elongate, cubitus and hind crossvein nearer to margin. 



MURDOCKIANA, new genus. 



Genotype. — Ewphorocera gelida Coquillett, Rev. Tach., 1897, p. 101. 



Differs from Euphorocera as follows : 



Female. — Front not widening as rapidly as the face, the frontalia 

 nearly as wide as one parafrontal; eyes more thickly hairy; outer ver- 

 tical bristle nearly as long as inner, strongly curved outward ; epistoma 

 characteristically nasute, projecting strongly between the vibrissae; 

 palpi more slender; cheeks much broader, over two-fifths of eye- 

 height. Four lateral scutellar bristles and a separated discal pair. 

 Abdomen hairy, with erect discal and marginal bristles ; anal segment 

 thickly set with same, especially below. Costal spine long. Apical 

 cell closed, not so elongate; hind crossvein not so sinuate. Third 

 vein bristled halfway or less to small crossvein. 



Male. — Compared with Ewphorocera male, the front is conspicu- 

 ously hairy and proportionately broader, the frontalia broader 

 behind, eyes thickly hairy, cheeks well over one-half eye-height, third 

 antennal joint much enlarged and the second comparatively short- 

 ened, hypopygium smaller, abdomen ovo-elliptical, the claws not 

 nearly so elongate, and the other characters as described above for 

 the female, except that there are only three lateral scutellars and the 

 disk of scutellum bears many hairlike bristles. 



The genotype is from Point Barrow, Alaska, collected by Mr. John 

 Murdock, in honor of whom the genus is named. 



Fanuly CROCUTIDAE. 

 PSEUDOSIPHONA, new genus. 



Genotype. — Sipliona irevirostris Coquillett, Rev. Tach., 1897, p. 76. 



Very distinct from Sipliona, differing in possessing a short fleshy 

 biflexed proboscis, the second flexure being constituted simply by a 

 prolongation backward of labella which are folded on tip of proboscis. 

 Form of body shortened and broadened. Second aristal joint short, 

 or but slightly elongate. 



SIPHONOPSIS, new genus. 



Genotype. — Sipliona plusiae Coquillett, Can. Ent., 1895, p. 125. 



Labellar prolongation much greater than in Pseudosipliona, but 

 fleshy rather than bristlelike, and thus not at all of the character of 

 Sipliona. The second aristal joint is elongate. Arista practically 

 bare instead of pubescent. Palpi small, slender, instead of clubbed. 

 Third antennal joint acute on upper apical corner instead of rounded 

 apically. 



