henry j. franklin. 173 



South and Central American and Mexican Species 

 of psithyrus. 

 Females of only two and males of only two species of 

 Psithyrus have to my knowledge been collected in the New 

 World south of the United States. One of the males has 

 not been heretofore described. It is closely related to con- 

 sultus and may be a variation of that species, or it may be 

 the male of intrudens. I have seen fit, however, to describe 

 it here as new, from the single specimen before me. The 

 two species of females may be conveniently separated from 

 each other and from variabilis and instilaris, the two United 

 States species females of which are likely to be found in 

 Mexico, by the following key : 



Abdomen entirely black above 1. 



Abdomen not entirely black above 2. 



1. Mesopleura yellow iiitrutlens. 



Mesopleura black variabilis. 



2. Mesopleura mostly black ; third and fourth dorsal abdominal seg- 



ments with white pile brasiliensis. 



Mesopleura mostly yellow ; dorsum of abdomen with black and yel- 

 low pile only iusularis. 



The males may be distinguished from cortsjilius and the 

 male of variabilis, the two United States Psithyrus males 

 likely to be found in Mexico, by the following key : 



Mesopleura covered with yellow pile to bases of legs 1. 



Lower portion of mesopleura covered with dark brown or black pile. 



vai'iabilis. 



1. Third dorsal abdominal segment clothed with yellow pile from side 



margin to side margin COiLSUltus. 



Third dorsal segment with black pile in middle 2. 



2. First dorsal abdominal segment yellow all the way across. 



sololeiisis. 



First dorsal abdominal segment black in the middle and with a 



yellow tuft on each side guateiiialeiisis. 



Psithyrus sololeiisis new species. 

 Type. — From Olas de Moka, Department Solola, Guate- 

 mala. Deposited in collection of Massachusetts Agricultural 

 College. 



Fifth antennat segment nearly equalling in length the third and fourth 

 together. Face dark, but with soyne yellow pile above bases of antenna:. 



TR.\NS. AM. ENT. SOC, XXXIX. 



