158 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.42. 



at base; the posterior tibiae are straight, but inner edge is regularly 

 emarginate in the median third. 



The species belongs to a group not represented in North America, 

 but would rank near the artificial group Cnemocyllus Dietz, because 

 of the dissimilarity of the hind tibise in the two sexes. 



ECTHETOPYGA, new genus. 



Name derived from sKderoc (exposed) + Tiuyrj (pygidium). 

 The following genus belongs in Lacordaire's classification to Curcu- 

 lionides Phanerognathes Apostasimerides, Phalange I, Section A, 

 Tribu Menemachides, Groupe Menemachides vrais. In our modern 

 classification it seems to belong to subfamily Menemachinae, Tribe 

 Menemachini. 



Female. — Beak -about as long as thorax, cylindrical, arcuate; 

 scrobes beginning at apical fifth, arcuate and directed at eyes. 

 Antennae moderately slender; scape attached slightly behind the mid- 

 dle of beak, hardly reacliing eyes; funicle with first joint elongate, 

 twice as long as second joint, which is only slightly longer than the 

 tliird, joints 3-7 short, obconical, increasing in breadth; club very 

 little wider than seventh funicular joint, oblong oval, articulated, 

 the first joint occupying about one-half of the mass, second and third 

 very short. Eyes large, convex, almost round, separated by two- 

 thirds the width of the beak below and by the width of the beak above. 

 Prothorax transverse, slightly convex, sides straight to middle, then 

 roundingly narrowed to apex, minutely constricted before apex, base 

 outwardly convex, apex barely half as wide and truncate. Scutellum 

 triangular, roundingly truncate at apex, inserted between the elytra. 

 Elytra very slightly convex, oblong, about twice as long as wide, 

 rounded at humeri, and at external, and sutural apical angles ; widest 

 near base, slightly wider than prothorax. Pygidium exposed, hori- 

 zontal, almost flat, evenly rounded behind. Legs moderately robust; 

 femora strongly enlarged, each armed with a large triangular tooth; 

 tibiae shorter than femora, apically enlarged, compressed, basally 

 arcuate, apically mutic; tarsi moderate, first two joints small, trans- 

 verse; third longer, bilobed; fourth slender, half included between 

 the lobes of the preceding; claws basally strongly toothed, slender, 

 diverging. Prosternum convex, long in front of coxas; coxae globular, 

 distinctly but very narrov/ly separated, cavities closed beliind. Meso- 

 sternum transversely strongly depressed in front of coxae, side pieces 

 large; coxae rather widely separated, open beliind, the intercoxal 

 pieces truncate. Metasternum flat, median longitudinal suture dis- 

 tinct; episterna large; coxae separated by transverse arcuate piece, 

 cavities open behind. Intercoxal process of first abdominal segment 

 broad,. convex in front. First and second abdominal segments large. 



