76 CALIFORNIA ACADEMY OF SCIENCES. 



form belongs to the group zonati, of Piaget (Les Pedi- 

 culines p. 187) and shows but slight differences from 

 several of the species of this group already described, 

 one or two from the same host, indeed; but on the other 

 hand Nitzsch's and Piaget's species differ among them- 

 selves but little, and the American specimens differ 

 quite as much from any described species. In fact they 

 are interesting as showing a combination of several 

 characters which are presented as diagnostic of cingu- 

 latus (the interrupted first abdominal band), zonarius 

 (the hairs and spines of the temples, and the head 

 longer than wide), and scalaris (the size). In addition 

 they present characters (metathoracic hairs, et al.) 

 which are not shown by any one of the described spe- 

 cies. I describe the American form therefore as a new 

 species. The group needs revision; probably four or 

 five of the present species should be reduced to varie- 

 ties of the oldest named form, i. e. cingidatus. 



Description of the female. Body, length 1.71 mm., 

 width .5 mm.; readily distinguishable by its general 

 dark color, and rounding, uncolored clypeus with the dis- 

 tinct colored signature, on each side of which lie the 

 narrow triangular projections of the anterior ends of 

 the antennal bands; the posterior ends of the antennal 

 bands bend so strongly in at the suture that they mark 

 the fore part of the head off from the hind part into a 

 small cone. 



Head, length .4 mm., width .34 mm.; elongate, tri- 

 angular, with clypeus broadly rounding, the uncolored 

 region slightly expanded beyond the suture; two short 

 hairs on the rounding margin of the uncolored clypeus, 

 one rather long hair in front of the trabecule; trabecu- 

 Ise prominent, angular, reaching beyond the first joint 

 of the antennte; antennse short, reaching barely two- 



