﻿SOME NEOTROPICAL BIRD LICE — CARRIKER 



379 



ACIDOPROCTUS HOPKINSI. new species 



Figure 44, d-(j 



Types. — Male and female adults, from Dendrocygna autumnalis 

 discolor, collected b}^ the author at Simiti, Bolivar, Colombia, March 

 31, 19-17 ; U.S.KM. No. 589G6. 



Diagnosis. — The ground color of the insect is pale brownish, with 

 most of the body markinprs dark brown (not pitchy black on a clear 

 ground as in other species of the genus), agreeing in this respect with 

 A. rostratus. The only pitchy markings are those at the base of an- 

 terior mandibular condyles, at base of occipital bands, and at each side 

 of the anterior portion of the pterothorax at its point of attachment 

 with the prothorax. In the male the whole pleurite is dark brown, 

 with a darker band along the inner margin in segments I to III. In 

 the female there is a dark-brown band along the inner margin of pleu- 

 rites I to VII, with a paler brown patch covering the median portion of 

 the sclerite but not reachinc; to the lateral margin. 



Table 1. — Measurements of Acidoproctiis hopkinsi and A. rostratus 



Tergites I to V are divided medially in the male; the remainder 

 are entire, while in the female all tergites from I to VII are divided. 

 The sternites of both sexes are entire but do not seem to extend later- 

 ally to the paratergals. There is a slight sexual dimorphism in the 

 shape of the frontal emargination, that of the female being almost 

 square, with anterior portion not constricted (fig. 44, d-f). The ab- 

 dominal structure also differs in the sexes. Pleurites I to III are nor- 

 mal and equal in both sexes, but in the male the abdomen abruptly nar- 

 rows with segment IV, then decreases gradually in width to VII, and 

 Avith pleurites IV to VT of abnormal shape (fig. 44, ^) . In the female 

 the abdomen increases in width gradually from I to III, then gradually 

 narrows to VII. The pleurites are equal in structure from I to VII, 

 but all have a peculiar enlargement at the inner anterior corner, 



