F. R. COLE 47 



I have seen numerous specimens of this form from CaUfornia, 

 and was able to get a number of notes on it, which are included 

 in another part of this paper. There is a good series at Pomona 

 College, Claremont, California. 



Opsebius diligens var. hyalinus new variety 



$. Very near (ii%ens 0. S. in appearance. Antennae brown. Eyes short 

 black pilose. Pile of mesonotum and scutellum brownish-yellow. Gray pile 

 on front and sides of thorax and on pleura. 



Abdomen black, finely punctate. Dorsum of second and third segments 

 with yellowish brown pile. Incisures, except first, reddish brown. Some Vjlack 

 pile on base of segments two, three, four and five. Gray pile on segments four 

 to six. 



Legs a dull straw yellow. Wings hyaline with brown veins. Venation and 

 shape of wings as in (Hligens. Length, 2.5 mm. Wing, 3.20 mm. 



Habitat. — San Diego County, California. One specimen col- 

 lected by E. P. Van Duzee (X, 4, 1913). 



One other specimen collected at Berkeley, California, May 8, 

 1915, by Mr. M. C. Van Duzee, is intermediate between paucus 

 and diligens, and might well be placed with hyalinus. The wings 

 are hyaline and the venation the same. The pile of the body is 

 almost entirely brownish yellow. Length, 5 mm. 



Opsehius gagatinus Loew, 0. diligens 0. S. and 0. paucus O. S. 

 are very closely related. I have seen typical forms of the last 

 two, and also specimens which are hard to place. Two speci- 

 mens loaned for study by Cornell University would, on account 

 of the closed anal cell, be placed under gagatinus, an eastern 

 species. These specimens were collected by Professor Bradley 

 in the Giant Forest, Marble Fork, King's River Trail, 6,500 feet 

 elevation, California, on July 24, 1907. I have seen individuals 

 from near this locality which would be placed in paucus 0. S. 

 on account of the open anal cell, but which were hardly distin- 

 guishable from the two specimens above mentioned in other 

 ways. It is possible that the open or closed anal cell may not be 

 a character of specific importance in this little group. In one 

 wing of the smaller specimen from the Giant Forest there are two 

 supernumerary cross-veins and two extra cells (see fig. 25a). 



Opsebius paucus (PI. VIII, fig. 25.) 

 Opsebius paucus O. S., Western Dii)tera, p. 279. 



"Very likeO. diligens, but smaller, 4-5 mm. long; sixth vein interrupted be- 

 fore the nearest cross-vein, and thus the anal cell open; the branches of the 



TRANS. AM. ENT. SOC, XLV. 



