362 ENTOMOLOGICAL NEWS. [Oct., 'l2 



Heterodoxus armiferus n. sp. (Figs. A, B, C. D). 

 Four specimens, one male and three females sent by Pro- 

 fessor W. B. Herms, collected from a dog (Berkeley, Cal.). 

 One can scarcely see how two such closely related forms can 

 come from hosts so widely separated, both geographically and 

 systematically unless by some process of "straggling"." This 

 species generally resembles macropus, but is much smaller 

 and the abdomen of the male is truncate. 



Description of male: Head conical, broader than long; clypeus 

 slightly angled on the meson and rounding on the sides ; temples 

 .traight laterally, rounded narrowly at the posterior angles ; occiput 

 concave; ocular emarginations lacking, being completely filled by the 

 large eyes; ocular fleck large, prominent, jet black. Two hook-like 

 spines on under side of head (Fig. C). more developed than in the 

 preceding species (Fig. F) ; clypeal hairs fine, inconspicuous, except 

 for one long spine just before the eye; eye with one short spine 

 on the surface ; temples with two long spines on the angle and 

 several short ones ; occiput with short heavy spines and two 

 longer, lighter ones. Thorax well developed ; prothorax laterally and 

 posteriorly rounded, with a row of strong spines on those margins ; 

 mesothorax small but distinct (Figs. A & B), with sides rounded and 

 a short heavy spine on each side; metathorax trapeziform with pos- 

 terior margin slightly convex ; a number of spines on the margin and 

 surface. Abdomen almost quadrilateral ; last segment broad, trun- 

 cate, slightly rounded ; a row of closely set spines across each seg- 

 ment, long and short spines alternating. Last segment of female with 

 forceps-like appendages (Fig. D). 



DIMENSIONS. 



Length Width 



Male Female Male Female 



56 .58 

 49 -51 



.20 .20 



.48 -So 



.72 .81 



Total 1.76 1.98 



As some of the segments overlap there is a discrepancy between 

 the total length and the sum of the various lengths. 



This paper was prepared in the entomological laboratory of 

 Stanford University. 



