162 Annals Entomological Society of America [Vol. IV, 



Basal part of the abdomen largely dark in ground color and gray pol- 

 linose, last three segments red in ground color and gray pollinose. 

 Male genitalia slightly shorter than the last two abdominal segments 

 combined, rather small and compact; appendages red, from lateral 

 view of nearly the same width throughout and rounded at the apex. 



The entirely hyaline wings, the uniformly black femora and 

 the small size of the specimens make the species easy of deter- 

 mination. The female genitalia shining black with a distinct 

 circlet of spines at the tip. 



The male type and two other males and four females 

 from San Jose, Mexico, collected by D. L. Crawford and 

 McConnell. 



Proctacanthus philadelphicus Macquart. 



Total length 28 to 36 millimeters. Mystax dark yellow, usually with 

 some black bristles intermixed, beard slightly paler than the mystax, 

 palpi black and mostly with black hairs; occipito-orbital bristles part 

 black and part yellow. Thorax rusty brown pollinose, mesothoracic 

 dorsum with short black hairs anteriorly and with black bristles and 

 hairs posteriorly, scutellum with numerous black bristles and hairs and 

 often with a few white hairs intermixed. Legs in most part brown 

 with black bristles and pale hairs, femora darkest anteriorly, wings 

 uniformly brown all over. Abdomen rusty brown pollinose. Male 

 genitalia slightly shorter than the last two abdominal segments com- 

 bined, appendages brown, from side view nearly straight and near the 

 same width throughout, the tips rounded but not curved towards each 

 other. Female genitalia shining black, end piece rather broad, sparsely 

 hairy and with a circlet of strong black spines. 



The intense brown color of the body and wings and the 

 dark yellow mystax are characteristic of the species. 



Specimens from New Jersey, Maryland, Connecticut, Mas- 

 sachusetts, Virginia and Pennsylvania. 



Proctacanthus longus Wiedemann. 



Total length 32 to 36 millimeters. Mystax yellow, beard paler than 

 the mystax, palpi black with paler hairs, occipito-orbital bristles part 

 black and part pale. Thorax brown, gray pollinose, mesothoracic 

 dorsum with the usual markings rather plainly shown, anterior part 

 mostly with short black hairs, posterior part with black bristles, scutel- 

 lum with black bristles and hairs; legs brown with black bristles and 

 numerous pale hairs; tibiae slightly lighter than the femora; wings 

 uniformly brown, wide and rather long. Abdomen brown, brownish 

 gray pollinose, male genitalia shorter than the last two abdominal seg 

 ments combined, from side view appendages nearly straight, of nearly 

 uniform width with the tips rounded but not curved toward each other 

 when viewed from above; female genitalia black with a terminal circlet 

 of strong spines. 



