CHAMBERLIN: HENICOPIDAE OF AMERICA NORTH OF MEXICO. 11 



Prosternum and prehensorial feet also of about same shade as head. 

 Legs and antennae yellow or, in darker individuals (see var. a infra), 

 the latter brownish with distal end paler and the anal legs dusky. 

 Venter greyish to yellowish brown, the posterior segments darker as 

 usual. 



Slender; the body attenuate gradually and but little from the eighth 

 segment cephalad and more abruptly narrowed from the tenth seg- 

 ment caudad; from eight to nine times longer than width of tenth 

 plate. Nearly glabrous, being provided very sparsely with very short 

 hairs which are more numerous on the legs. Antennae densely clothed 

 as usual. 



Head subcordate; nearly equal in length and breadth being but 

 slightly longer (ratio 35:33 or less). Marked with two diverging 

 sulci on posterior portion and with a number of shorter and more 

 indistinct ones more lateral much as in fulmcornis. A weak furrow 

 extending from anterior edge between antennae caudad to suture and 

 more indistinctly to caudal margin. 



Prosternum relatively a little narrower than in fulmcornis, being 

 usually but about 1.68 times wider than greatest length. Extending 

 forward to same point, or nearly so, as in fulmcornis. Prosternal teeth, 

 small; 3+3, the outermost on each side much the smallest, minute 

 or rarely obsolete or absent. 



Antennae short; cir. 3.2+ times longer than the head, while the 

 body is nearly 2.8 times longer than them. Antennae distad of the 

 large second article submoniliform, and the articles all short. Arti- 

 cles from 28, the most usual number, to 31; the third and fourth, 

 seventh and eighth, and tenth and eleventh are nearly always con- 

 spicuously shorter than the adjacent articles, while in some individuals 

 the thirteenth and fourteenth may also show reduction. (See Plate 

 2, fig. 10). 



Dorsal plates with the median region strongly arched and the 

 borders low with the edges somewhat uplifted as in fulmcornis, present- 

 ing a longitudinal sulcus parallel to lateral margin at inner edge of 

 depressed border with a transverse sulcus parallel to caudal border 

 and connecting the two lateral sulci, this transverse sulcus, especially 

 on the more anterior major scuta sharply impressed and conspicuous. 

 Convex portion of plate in front of the transverse suture with a weaker 

 and finer longitudinal median sulcus and one or two pairs laterad of 

 this. The transverse sulcus, especially on the anterior segments, 

 seems to be much more distinct than in fulmcornis and also relatively 

 farther _ from the caudal margin. Caudal margins of minor plates 



