MORGAN HEBARD 97 



convex, subparallel; caudal angles rectangulate, broadly rounded; caudal mar- 

 gin broadly convex. Tegmina about twice as long along humeral trunk as dor- 

 sal width; dorsal surface deplanate, rugulose, separated from less heavily punc- 

 tulate lateral surface by a heavy dorso-lateral keel, which disappears before the 

 distal margin; angle at costal margin acute but broadly rounded, distal margin 

 thence oblique to sutural margin. Abdomen widening very slightly and grad- 

 ually to sixth dorsal segment, then narrowing a little more sharply to apex. 

 Pygidium inconspicuous, dechvent, surface weakly convex. The latero-ventral 

 angles of the ultimate dorsal abdominal segment project as a minute tooth on 

 each side beneath the base of the forceps. Forceps cylindrical, very elongate 

 and slender, smooth but armed with a large proximo-internal tooth just beyond 

 the pygidium, feebly bowed in proximal third, thence almost straight but 

 weakly curved to immediate incurved apex, with internal margin very feebly 

 serrulate. Penultimate ventral abdominal segment with lateral margins 

 straight, convergent, rounding broadly into mesal third of free margin which 

 is feebly concave. Limbs elongate and slender. 



Length of body, 10.7; head, 2.3; pronotum, 1.9; exposed portion of tegmen 

 along humeral trunk, 1.9; exposed portion of tegmen along sutural margin, 

 1.7; forceps, 8.9; caudal femur, 3.3 mm. Width of head, 1.9; pronot*im, 

 1.9; abdomen at widest point, 2.7 mm. 



Head, pronotum, tegmina and abdomen shining black. Antennae deep 

 chestnut, excepting first joint which is shining black. Forceps in brief proxi- 

 mal portion shining black, remaining portions deep chestnut. Limbs shining 

 black, except distal portion of tibiae and the tarsal joints which are auburn. 



The type of this remarkable insect is unique. 



ORTHOPTERA 



Blattidae 

 pseudomopinae 

 PLATYLESTES'5 new genus 

 This genus, a member of the Group BhitteUites, shows rela- 

 tionship to Latiblattella Hebard in the Type B armament of the 

 ventro-eephalic margin of the cephalic femora, which bears three 

 heavy, elongate distal spines, the very broad form and general 

 structure of male subgenital plate. Other features are very dis- 

 tinct, agreeing instead with Neohlattella Shelf ord; the most impor- 

 tant of these are the tegmina which have the discoidal sectors 

 longitudinal and the dorsal surface of the male abdomen which 

 is unspecialized. 



Genotype. — Platylestes colombiae new species. 

 Description of Genus. — Sexes similar, except that in the female 

 the pronotum and abdomen is more ample. Size rather large, 

 1^ From 7rXaTiij = broad and X7;Tri7s = plunderer. 



TRANS. AM. ENT. SOC, XLV. 



