AMERICAN DIPTERA. 



37 



species is 7 mm. (with some specimens measuring 9 mm. referred, 

 here liy Snow , while the present specimen is 1.3 mm. The front is 

 yellow, with a darker reflection ; vertex black. Facial stripe nar- 

 row, obsolete above tubercle ; cheeks blackish posteriorly ; pile of 

 thorax yellowish. Yellow markings of abdomen agree in all par- 

 ticulars with Williston's description of pcvuxillm, but there are no 

 spots on front angles of fifth segment. Legs reddish yellow, base of 

 front and middle femora and all of hind femora except tip, black. 

 Wings hyaline ; stigma elongate, flavous, occupying all of third 

 costal cell, except a small clear portion in middle just before end of 

 auxiliary vein. 



14. Spliseroplioria n. sp. (?)— aff. cylindrica Say. 

 One female differs from S. cylindrica as follows : 



9 .—Length about 6 mm. ; of wing, 5 mm. Face wholly light yellow, cheeks 

 with a blackish line bordering lower margin of eyes, oral margin narrowly black- 

 ish on edge. Front black, but the yellow of face extends up on each side about 

 half the length of front. Pleurse greenish yellow above, shining greenish black 

 below. Abdomen deep shining black, a slightly interrupted yellow band across 

 second segment ; a similar, but entire yellow band across third and fourth seg- 

 ments, that on fourth situated more anterior to middle of segment. Fifth seg- 

 ment with a decidedly interrupted (in middle)!yellow band near front border, the 

 inner ends of the yellow being swollen. Sixth segment yellow, with five blackish 

 spots. Seventh segment yellowish, brownish on median base. Venter and legs 

 light yellow, the hind tarsi brown, middle and front tarsi with a slight brownish 

 tinge. Wings hyaline, longer than al)domen, stigma pale yellow. 



Fort Collins, Colorado (Gillette). 



This comes near to Williston's var. (c.) 9 from New England, 

 mentioned in his description of *S'. cylindrica (see monogr. p. 105). 

 It may be the 9 of this species. 



15. Baceha clavata Fabr. 



Bath, Jamaica (E. M. Swainson). One male I identify as this 

 species. The face, however, has a steel-bluish ground color, being 

 whitish pollinose on sides, but showing a bluish reflection. First 

 abdominal segment is blackish, but with a bluish reflection. Vertex 

 bluish black. Dark portions of abdomen, except first segment, 

 opaque brown. Length nearly 10 mm. ; otherwise agrees well with 

 Williston's description of B. hahhita Walker, which is a synonym. 

 The facial tubercle, however, is not so strongly pronounced as in 

 Williston's figure of the head of babista 9 . The scutelluui is 

 brownish yellowish, with a slight metallic greenish reflection. 



TRANS. AM. ENT. SOC. XXII. MARCH, 1895. 



