52 Bulletin of the Brooklyn Entomological Society, Vol. XIV 
the sclerite. The eighth tergite is produced posteriorly into a 
clearly defined triangular process at the apex of which there are 
several long hairs. Many short hairs are placed along the mar- 
gin. The stylet is cylindrical, about six times as long as broad 
and has toward the apex two long bristles and two sense cones. 
The receptacula seminis are two in number and are similar to the 
same organs in H. dippiet Roths., as figured by Fox.* The ap- 
pendix is longer in comparison to the body in the present species 
than in H. dippiet, according to Fox’s figure. 
Length—6.2 mm. (in a slightly contracted condition). 
The type, a female, was taken from the nest of Aplodontia 
rufa Raf. at Puyallup, Washington, by Mr. T. H. Scheffer. 
The genus Hystrichopsylla Tasch. up to the present contained 
but one Nearctic species, H. dippiet Roths. H. schefferi is a 
much larger species, and is further distinguished from H. dippiei 
by the difference in the number of spines in the pronotal cten- 
idium, there being thirty-six in the latter and forty-six in H. 
scheffert. 
Stenoponia wetmorei sp. nov. 
Head.—The frons bears five bristles, three in a vertical row 
near the margin of the antennal groove and two placed in such 
a way that they form, with the lowest bristle of the vertical row, 
a horizontal row beginning near the insertion of the maxillary 
palpi. On the upper part of the occiput there are four bristles 
and on the lower, in the posterior angle, there are five. The long- 
est bristle of the second antennal segment equals the length of the 
third segment. The rostrum is short, equal in length to the max- 
illa. Eye absent. On the fore gena there is a ctenidiuim) of 
twelve spines. The genal process is rounded and extends down- 
ward a distance equal to the length of the last spine of the 
ctenidium. 
Thorax.—The pronotum bears on the posterior border a 
ctenidium of about fifty spines. Anterior to this ctenidium there 
are four rows of about twenty-four bristles each. The meso- 
and meta-thoraces each bear four rows of numerous bristles. 
There are about twenty bristles on the mesepisternum, fifteen 
on the mesepimeron, and four on the metepisternum. On the 
* U.S. Pub. Health Service, Hygienic Lab. Bull. 97, Pl. xix, fig. 52. 
