1921] NATURAL SCIENCES OF PHILADELPHIA. 207 



Hyporhicnoda luaronensis new species. Plate XII, figure 5. 



This species is very closely related to H. litomorpha Hebard, 

 from Colombia. Decided similarity is shown by the color and 

 texture of the dorsal surface in the female sex. It differs in the 

 more slender form, head with narrower interocular space and slightly 

 heavier impressed punctae, stronger convexity of the thoracic seg- 

 ments and in the decidedly greater reduction of the limb armament. 



Type: 9 ; La Forestiere, upper Maroni River, French Guiana. 

 [Paris Museum]. 



Size medium, form elongate and rather narrowly oval for the 

 genus, the greatest width being across the abdomen mesad. Head 

 hidden under pronotum, broad, the reduced eyes widely separated 

 b}^ a distance (1.8 mm.) slightly greater than that between the 

 weakly defined ocellar spots; exposed surface coarsely and rather 

 thickly impresso-punctate, face flattened, very feebly convex, with 

 two transverse impressions just below and between the ocellar areas 

 and showing very slight concavity on each side above the labial 

 suture. Pronotum extending well beyond head, showing a very 

 feeble subcucullate condition, very strongly convex to the scarcely 

 reflexed, narrow lateral portions of the cephalic margin; this margin 

 subcingulate, broadly convex mesad but more strongly so than in 

 litomorpha, with lateral margins broadly convex to the latero-caudal 

 angles, which are rounded and weakly produced caudad, forming 

 an angle of slightly less than ninety degrees ; caudal margin broadly 

 convex mesad, showing broad and very weak convexity lateracl, 

 so that it is nearly transverse. Mesonotum and metanotum with 

 latero-caudal angles produced and sharply rounded. Entire dorsal 

 surface apparently smooth, somewhat polished, but under high 

 magnification seen to be supplied with minute flattened rounded 

 rugae, these slightly more apparent on the caudal margins of the 

 segments, so that they appear very finely beaded. Tegmina and 

 wings absent. Supra-anal plate heavily chitinous, over twice as 

 broad as long, the free margin convex, showing sUght flattening 

 laterad and a trace of median emargination. Cerci very short 

 and lamellate, scarcely projecting beyond the body outline. Sub- 

 genital plate very large. Limbs showing very decided atrophy of 

 armament. Ventro-cephalic margin of cephalic femora armed with 

 three heavy spines, succeeded by an irregular row of rather elongate 

 chaetiform spines, terminated by a heavy distal spine. Other ven- 

 tral femoral margins, except caudal margins of caudal femora, 

 which are wholly unarmed, supplied with a single heavy distal spine, 

 all with widely spaced large spiniform hairs. Tarsi heavy, caudal 

 metatarsus as long as combined length of succeeding tarsal joints, 

 with two rows of spines ventrad and more distantly placed spines 

 on the sides. Four proximal tarsal joints supplied with pulvilh, 

 these occupying the entire ventral surfaces except that of the meta- 



