F. R. COLE 59 



black with yellow markings, which differ some in the two specimens I have. 

 First and second segments black. Posterior margin of third abdominal seg- 

 ment broadly yellow in middle, the yellow reaching almost to lateral margins. 

 Posterior half of fourth segment orange-yellow. Genitalia black, marked with 

 yellow. Pleura shining black. Venter blackish brown, the segments with 

 yellow posterior borders. Short whiti.sh hair on abdomen. Squamae whitish 

 byaline. Legs yellowish, femora and tibiae brown except the tips. Tarsi a 

 brownish-yellow, most of last joint black. Claws black. Wings brownish 

 hyaline with brown veins. Second longitudinal vein missing. Very near A. 

 nigrina Westwood. Length, 3 to 4.5 mm. 



Habitat. — Two female specimens from Santa Rita Mountains, 

 Arizona, May 24. (Hubbard and Schwarz.) 



Type.— In U. S. N. M., no. 21205. Holotype a female. 



OGCODES 



■Ogcodes Latreille, Prec. Car. Gen. Ins., p. 154, (1796). 

 Oncodes of authors. 



Antennae placed on lower part of head near the mouth-parts 

 and ending in a long thin style or arista. Proboscis absent. 

 Head of male larger than that of female, almost all eyes except 

 small vertex (on which are two ocelli) and the small space at the 

 bottom of the head, on which are the antennae and indistinct 

 mouth-parts; frons sHghtly produced below, visible from side; 

 back of head rather inflated in male, but more so in female and 

 crammed onto the thorax; jowls slightly inflated. Proboscis 

 absent, the place where it should be being closed by a membrane. 

 Eyes enormous, quite bare. Antennae apparently two-jointed, 

 dove-tailed into face; apparent basal joint cylindrical, short and 

 thick; apparent second joint oval, with long apical thin style 

 which is dilated at its base but ends in a minute hair-like bristle. 



Thorax forming a complete sphere; humeral, praealar and 

 post-alar calli large, but not very conspicuous; pubescence 

 rather dense and soft but hardly abundant enough to be furry, 

 and without the slightest sign of bristles or long hairs even on the 

 post-alar calli or the margin of the scutellum. Scutellum large, 

 with a very deep rounded margin, which leaves only a small por- 

 tion of the disc rather flat, pubescence similar to that of thorax; 

 metanotum rather small. 



Abdomen dorsally arched but hardly globular, short ovate 

 with a blunt base and tip in the male, but short and round in the 



TRANS. AM. ENT. SOC, XLV. 



