DIPTERA. 303 



OSPRIOCERUS (p. 168). 

 Ospriocerus ? (p. 168). 



To the locality given, add : — Mexico, Jaral in Guanajuato {Schumann). 



A single specimen, agreeing with others from Northern Sonora mentioned by Osten 

 Sacken, except that they have the venter wholly black. 



3. Ospriocerus diversus, $p. n. (Tab. V. fig. 16, $ .) 



$ . Antennas black, third joint more than twice the length of the first two together, excised on the distal two- 

 fifths, and with a minute thickened style at the tip. Front brownish-yellow ; face white-pubescent ; 

 cheeks, immediately below the eyes, shining black; bristles of the face black. Mesonotum opaque, 

 brownish-grey, with three dark brown stripes, the middle one divided by a lighter- coloured line, the 

 lateral ones composed of two elongated spots ; bristles white. Abdomen a little longer than the wings, 

 black; the distal segments shining, the anterior ones thinly yellowish-pollinose ; a part of the second 

 segment, the third, fourth, and fifth segments, and a spot on the sixth, red. Legs yellowish-red; the 

 upperside of the four anterior femora, the hind femora for the greater part, and the inner distal side of 

 the hind tibiae, black ; bristles black and light yellow, the hair white. Wings strongly tinged with 

 yellowish or brownish, lighter-coloured on the basal posterior part ; fourth posterior cell closed in the 

 margin or narrowly open. Length 18-19 millim 



Hob. Mexico, Venta de Zopilote in Guerrero (H. II. Smith). 



Two specimens. This insect has the lower portion of the face slightly convex, not 

 straight or gently concave as in the preceding species. It differs from the typical 

 Osprioceri in the more slender abdomen (which wants the characteristic brick-red 

 coloration) and the minute style. I cannot believe that the absence or presence of a 

 small style is sufficient to separate Stenopogon from Ospriocerus : a better distinctive 

 character is the excision of the distal part of the third antennal joint on the under- 

 side. Another example from Chilpancingo, apparently belonging to a different species, 

 has the abdomen black throughout, the legs black, except the upper part of the four 

 anterior femora and the basal portion of the front tibiae, the wings hyaline, except for 

 the very narrow brown clouds along the veins, and the markings of the mesonotum 

 somewhat different. 



SCLEROPOGON. 

 Scleropogon, Loew, Centur. vii. no. 45 (1866). 



1. Scleropogon truquii. 



Dasypogon truquii, Bellardi, Saggio etc. i. p. 76, t. 1. fig. 10 \ 



Hah. Mexico 1 , Tepetlapa and Venta de Zopilote in Guerrero (H. H. Smith). 



Ten specimens, varying in length from 16-25 millim. I do not feel quite sure of 

 the determination, inasmuch as the Guerrero examples want the fuscous spot in the 

 middle of the wings in front, and they have the abdomen for the most part opaque 

 ochraceous, with the distal segments more or less reddish. None of them have an 

 additional posterior cell, the presence of which, however, is hardly a specific character. 



