28 INSECUTOR INSCITI^ MENSTRUUS 



New Hampshire (pt.), both sexes, are this species. The male 

 abdomen is more or less reddish on sides, the palpi and first 

 two antennal joints are yellowish to rufous. Otherwise fits 

 Wiedemann's description. No other species known to me fits 

 as well. It is quite probable that T. algens Wd. was a com- 

 posite species, including the female of the present form and 

 the male of the preceding, for the author probably had several 

 specimens. In such case the species must stand restricted as 

 above. 



Family EXORISTID^ 



Trisisyropa, new genus. 



Genotype, Trisisyropa vesiculata Townsend, new species. 



Differs from Winthemia as follows : Female. Much nar- 

 rower in form, the entire length conspicuously over three times 

 the greatest width. The whole head and appendages are so 

 similar to those of Winthemia as to defy exact verbal differ- 

 entiation, but the front is more prominent in profile, the fron- 

 talia are nearly or quite as wide as one parafrontal, and the 

 bristles of head are in general stronger. Anal segment prac- 

 tically without hairs among the bristles both above and below. 

 Abdomen narrowed, long-ovate. Hind tibiae not ciliate, only 

 very loosely-pectinate with longer bristles present. Small cross- 

 vein opposite point halfway between end of auxiliary and end 

 of first vein or nearer to latter. Cubitus considerably greater 

 than a right angle, the apical crossvein less bent in. No 

 median marginal macrochsetse on first abdominal segment. 

 Has a pair of large inflatable uterovaginal pouches in common 

 with Winthemia. 



Trisisyropa vesiculata, new species. 



Length of body, 8.5 mm. ; greatest width, 2.5 mm. ; length 

 of wing, 6 mm. One female, Lakehurst, Sebago Lake, Maine, 

 September 6, 1914, on foliage (Townsend). 



Frontalia black, antennse blackish with some rufous on in- 

 side of third joint, palpi pale rufous, face wholly silvery-white, 

 parafrontals golden. Thorax shining black, with silvery pollen 

 which is thinnest on disk, leaving five inconspicuous vittae. 



