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U. S. NATIONAL MUSEUM BULLETIN 209 



3. Dipogon {Dipogon) brevis Cresson 



Male: Forowing 3.2 to 4.6 mm. long; flagellar segments in profile 

 each convex below, so that the flagellum has a somewhat nodose 

 appearance; subgenital plate strongly compressed, with a sharp high 

 median longitudinal ridge which gives it a lanceolate shape in profile. 

 Sculpture a little smoother and pilosity a little shorter than in the 

 female. 



Female: Forewing 3.8 to 5.2 mm. long; frons, upper part of prono- 

 tum, and mesoscutum very strongly mat, without noticeable punc- 

 tures, with appressed dense pubescence, the hair sockets of which 

 are separated by about 0.3 the length of the hairs; mesopleuron 

 mat, without noticeable punctures, with dense appressed pubescence, 

 the hair sockets of which are separated by about 0.5 the length of the 

 hairs; sculpture and pubescence of metapleuron and propodeum 

 variable; second tergite mat, with dense appressed pubescence arising 

 from weak punctures that are separated by about 0.3 their diameter. 



Coloration of both sexes black to ochraceous, according to the 

 subspecies. Wings of female subhyaline, the forewing somewhat 

 infuscate basally, in a band at the level of the basal vein, in a broad 

 area extending from the base of the stigma to the apex of the third 

 cubital cell, and a little infuscate along the apical margin (pi. 1, fig. 10). 

 Wings of male a little more hyaline than in the female and with the 

 fuscous areas paler and a little less extensive. 



3a. Dipogon (Dipogon) brevis recalvus, new subspecies 



Male: Metapleuron subpolished, with weak fine punctures sepa- 

 rated by about 2.5 their diameter; propodeum moderatelj^ mat to 



Figure 72. — Localities for Dipogon brevis recalvus. 



