116 



Psyche 



[August 



.25 mm.; length of abdomen, .75 mm.; width of head, .16 mm.; 

 width of thorax, .26 mm. ; width of abdomen, .4 mm. 



The rows of hairs on the abdomen are fewer than in the female. 

 None of the tergites are divided and of the sternites the fourth and 

 fifth are divided into three plates and the third into two. The 

 number of the spines to each plate is practically as in the female. 



The genitalia differ from the genitalia of H. arboricola in the 

 broader basal plate and the differently shaped parameres and penis. 



Hoplopleura quadridentata Neum. 



Hoematopiniis (Polyplax) quadridentatus Neumann, Archives 



de Parasitologic, Vol. 13, pp. 

 51 1-513, figs. 13-14 (1909). 



Many males and females from 

 several skins of Nesoryzomys 

 narboroughi and N. indefessus 

 (Family Muridae) from the 

 Galapagos Islands, in the Stan- 

 ford University collection. 

 Neumann's specimens were 

 from another murid, Holochilus 

 squamipes, and were taken in 

 Peru. 



The pleural plates of the 

 specimens at hand differ some- 

 what from Neumann's figure, 

 but these differences are such 

 that they may easily be due to 

 mistakes in drawing or to mere 

 variation, of which there ap- 

 pears to be a certain amount. 

 The appended figures will serve 

 to supplement Neumann's de- 

 scription. 



As showing how slight our 



knowledge of the Anoplura is, 



it is worthy of note that this 



is the fourth record of an Ano- 



-. , , J J , . pluran from the South Ameri- 



Hoplopleura quadridentata ^ . . 



(Neum.) ; female. can region. Two other specics 



Fig. 12. 



