OSTEN SACKEN ON WESTERN DIPTERA. 291 



COS Eiver, New Mexico). — I have no specimen of this species. Is it not 

 the male of the preceding ? The difference in the coloring of the abdo- 

 men, between both corresponds exactly to the sexual difference of the 

 same kind in 0. wacus. 



4. OSPEIOCERUS MINOS n. sp., ^ . — Altogether black ; wings black- 

 ish. Length 17-18""". 



The face is slightly grayish-pollinose ; the abdomen is more cylindri- 

 cal, less flattened than in the male of 0. ceacus ; the last antenna! 

 joint seems a trifle longer. In other respects, the specimen looks like a 

 unicolorous wacus. 



Hob. — Golden City, Colo., July 3 (A. S. Packard). 



5. OSPEIOCERUS JEACLDES Locw, Centur., vii, 51, California. — I do 

 not know it. 



STENOPOaON and SOLEROPOaON. 



These genera, especially the former, are very abundantly represented 

 on the western plains and in California. Ten species of Stenojjogon and 

 two of Scleropogon are described by Dr. Loew from those regions. I 

 have several species which, I believe, are new, but I would not attempt 

 to describe them without comparing them with all the previously de- 

 scribed species, several of which I do not possess. 



DiCOLONUS. . 



I do not know B. simplex Loew (Centur., vii, 56), the Californian 

 species for which the genus was established. 



Callinicus. 



Callinicus CALCANEUS Loew (Ccntur., X, 32), for which the genus 

 was established, is not rare in California. I found it about San Eafael, 

 Marin County, May 27, and received several specimens from Mr. H, 

 Edwards, also taken in Marin County. 



Clavator. 



A species from Southern California agrees very well with the genus 

 Clavator^ established by Dr. Philippi for several species from Chili 

 (Verh. zool.-bot. Ges., 1855, 699, tab. xxvi, f. 31). The first of these 

 species, G. 'punctipennis, must be considered as the true representative 

 of the genus ; the other species have the third posterior cell closed and 

 the antenniE of a different structure ; hence it is very doubtful whether 

 they belong in the same genus. The agreement of my species is with C. 

 punctipennis. 



This generic identification would be rendered certain, if it could be 

 ascertained whether Clavator puncUpennis belongs in the number of 

 Dasypogonina which have a spur at the end of the front tibire. Dr. 

 Philippi does not say anything about it, and may have easily overlooked 

 this character. My C. sabulonum has such a spur. 



