﻿22 



PROCEEDmGS OF THE NATIONAL MUSEUM 



arched in both sexes; the pleurites are well developed and much darker 

 than the tergites. 



The male genitalia are large and heavy, with parameres nearly 

 straight, but slightly tapering and truncate at their tips. 



These specimens are also simUar to Menopon invadens, taken on 

 Acridotheres tristis (Hawaii), the description and figure of which agree 

 fairly well with the specimens from Guam, but there are certain dis- 

 crepancies that cannot be reconciled. 



MEASUREMENTS OF MYRSIDEA CUCULARE 



MYRSIDEA BAKERI, new species 



Figure 5 



Types. — U. S. N. M. No. 58965, male and female adults, from 

 Corvus kubaryi, collected by Rollin H. Baker on Guam Island (Mari- 

 anas), June 1945. 



Diagnosis. — Similar in a general way to the type of M. suhaequalis 

 (Lyonet) {=M. mesoleuca Nitzsch) but differing in many particulars. 

 It is a strikingly marked species, with the sexes highly dimorphic and 

 with abdominal segment I in the female peculiarly developed, much 

 wider than segments III, IV, and V and fused with 11. The chaeto- 

 taxy of the abdomen in the female is strongly developed, with most 

 of the hairs very long and coarse. Sternite I is thickened and deeply 

 pigmented and bears on its posterior margin and sternal surface a 

 series of long, coarse hairs, in addition to the four long spines at each 

 side. The posterior margin of the fused segments II and III is with- 

 out haii's on dorsal surface, but IV to VIII bear a series of long, strong 

 hairs rather widely spaced. Sternites III to VIII are thickly set with 

 very coarse hairs along their posterior margins, especially on lateral 

 portions. There are no weU-defined plem-al plates, except on I, II, 

 and III, the tergites being fused with the sternites at each side; 

 tergites II to VIII are separated medially, but the sternites are con- 

 tinuous, although faintly indicated mediaUy on II to IV, and all are 

 widely separated from one another by hyaline areas. 



