442 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



Head distinctly granulose. Fourth antennal segment twice as 

 long as third. Interantennal spine, short, straight. 



Thoracic segments very sparsely granulate; lengths of segments: 

 3.5, 2.8, 1.8 mm. Claws of foretarsi two, the inner very short, closely 

 appressed to base of outer. First spine of forefemur at twice its length 

 from tip of trochanter. Basal half of forefumur gradually thickened 

 to first spine. Armature of forefemur with inner row consisting of 

 long setae arising from wartlike bases, with a strong spine before apex. 



Abdomen on dorsal aspect practically parallel sided from apex of 

 third segment to seventh. Apical angles of terga very slightly pro- 

 duced, hind margin of terga with small blackish wart, wart on sixth 

 larger. Hind margin of sixth tergum medianly produced caudad. 

 Seventh tergum slightly shorter than sixth, not surpassing claspers, 

 with constriction beginning at middle; constriction shorter than basal 

 half, transversely corrugated on apical half, medianly ridged (fig. 37). 

 Hind margins of second to fifth sterna straight; of sixth shallowly con- 

 cave; of seventh deeply concave; of eighth very shallowly concave 

 (fig. 75). Sixth sternum twice as long as seventh. Eighth sternum 

 visible its entire width. Hypopygium opening upward; exposed 

 part of clasper on lateral aspect short, longer than wide, apex sharp, 

 pointing cephalad and rising above upper margin of clasper; with a 

 shallow lateral longitudinal furrow (figs. 2, 39). Upper lateral margin 

 of hypopygium stepped; apical process of trypopygium short, vertical, 

 not receding from caudal margin, relatively broad, with a deep V- 

 shaped apical notch (fig. 42) . 



Overall body length 23-24 mm. 



The striking appearance of the apical process of the hypopygium 

 easily separates the males of this species from all the others. Only 

 borincana has a somewhat similar process. The similarity of the 

 length of the thoracic segments to those of the female has been used 

 to associate the sexes. Figures 51, 86, and 138 show three aspects of 

 the end of the abdomen of the female of this species. The ninth 

 tergum in profile can be as in figure 2 or straight to the apex. 



Types: Hypotype, male, Mayaguez, Puerto Rico, September 29, 

 1947, collector J. A. Aguil6, USNM 63088. Parahypotypes, three 

 males, same locality and date. Additional females studied and 

 identified: three females, Ponce, Puerto Rico, collected from a 

 mosquito animal bait trap, March 1948, collector J. Maldon- 

 ado-Capriles; three females, two from Mayaguez, Puerto Rico, and 

 one from Aguadilla; all in the collection of the College of Agriculture 

 and Mechanical Arts, Mayaguez, Puerto Rico. 



