170 Annals Entomological Society of America [Vol. X, 



Occipital margin almost a straight line. Antennal bands distinct, of 

 moderate width, separated from each other at the front of head by the 

 rather wide clear area coincident with the ample emargination at the 

 borders of which they bend sharply backward for a short distance. 

 Antennal bands continue clearly across the bases of the antennas to the 

 very distinct ocular blotches at which points they are continuous with 

 the clearly defined occipital bands. Faint underlying bands extend 

 from the bases of the occipital bands convergingly toward the mandibles. 

 A broad band borders the occiput between the occipital bands. Five 

 short hairs on each margin between the anterior emargination and 

 trabeculcC, two on each side at the anterior border of the antennal sinus, 

 one just within the posterior angle of antennal sinus, three longer hairs 

 along the posterior half of temples, and eight weak spines on the dorsal 

 surface of head. Antennae rather stout, of three subequal joints, 

 none of which possess a projecting process. 



Thorax about three times as broad as long. Prothorax very short 

 as compared to breadth. Sides divergent to posterior margin, which is 

 somewhat 3-faceted. A strong spine at the posterior lateral angles 

 and one near each end of the middle facet. Metathorax shorter than 

 the prothorax and broader, the lateral border projecting on each side 

 as a sharply rounding prominence, and with a wide, deep posterior 

 median emargination. Three hairs set closely near the lateralmost 

 portions and a transverse row of four stronger spines. Legs relatively 

 short and stout. 



Abdomen oval in outline, one-fifth longer than wide, widest on 

 second segment. Segments one to three with pointed lateral plates 

 which are directed inward and backward. Each lateral plate with a 

 series of about five longish spines. First segment with two spines within 

 the thoracic emargination, four or five short spines along the lateral 

 margin, and a transverse series of about eighteen spines. Second 

 segment with a series on each side — just inside the lateral plates — of 

 about four weak spines, and a transverse row of about eighteen longer 

 spines. Segment three with a transverse row of about seventeen long 

 spines. Segment four with a transverse row of about thirteen spines, 

 and on each side a series of about five spines. Segment five with about 

 twenty-one spines in a transverse series. Segment six with a trans- 

 verse series of about thirty spines. Seventh segment with three long 

 spines at each posterior lateral angle, and a series of four placed medially. 

 Segment eight with a transverse series of six long spines. Terminal 

 segment subconical, sharply emarginate, and with four slender hairs 

 subterminally. Seventh segment with a pair of chitinized, lateral 

 female appendages. 



Head of male a trifle wider relatively than that of female; anterior 

 emargination deeper and more acute; antennal sinuses deeper; anterior 

 angle of temple much more rounded; occipital margin somewhat 

 concave. 



