2 PROCEEDINGS OF THE NATIONAL MUSEUM vol.82 



deeply, arcuately emarginate at middle of each elytron, with the 

 median lobe transversely truncate in front of scutellum; surface 

 rather coarsely, densely, irregularly punctate, smooth in front of 

 scutellum, and the intervals vaguely granulose. Scutellum triangu- 

 lar, acuminate at apex, and the surface finely, densely, vaguely 

 granulose. 



Elytra wider than pronotum at base, and slightly wider at base 

 than at middle; humeral angles broadly rounded; sides nearly 

 parallel from base to near middle, then feebly, arcuately narrowed 

 to the tips, which are separately broadly rounded, with a distinct 

 tooth near the sutural margin; surface finely, densely, uniformly 

 punctate, and each elytron with two or three more or less distinct, 

 smooth, longitudinal costae, and a round, deep, basal depression. 



Abdomen beneath densely, finely granulose, rather densely, finely, 

 irregularly punctate, and sparsely clothed at sides along anterior 

 margin of segments Avith long, recumbent, white pubescence; first 

 segment broadly, longitudinally grooved at middle; last segment 

 with two broadly arcuate emarginations at apex, forming a distinct 

 tooth on each side and one at middle of equal length. Prosternum 

 strongly convex, vaguely granulose, sparsely, irregularly punctate, 

 and sparsely clothed with fine, erect, white hairs; anterior margin 

 slightly elevated ; prosternal process obliquely expanded posteriorly, 

 with the apex broadl}^ angulated. 



Male. — Differs from the female in having the last abdominal seg- 

 ment broadly, feebly, arcuately emarginate at apex, and with a long 

 tooth on each side at the exterior angle. 



Length, 26-30 mm ; width, 11-12 mm. 



Type locality. — Guerrero, Mexico. 



Type and allotype.— U.S.Hii.M. No. 49550. 



Paratype. — In the H. E. Hinton collection. 



Remarks. — Described from three examples (one female type) . The 

 type was collected at an altitude of 2,400 feet by William Schaus; 

 the allotype is labeled " Sinaloa, Mexico " ; the female paratype was 

 collected at Tejupilco, Mexico, D.F., at an altitude of 3,960 feet, 

 during July 1932, by H. E. Hinton. The two vague, median depres- 

 sions on the pronotum of the type are entirely absent in the allotype 

 and paratype. 



This species resembles geniculata Thery, but it differs from that 

 species in having the scutellum elongate triangular, the femora uni- 

 formly green, and the last abdominal segment uniformly green, Avith 

 the emargination at the apex different. 



COLOBOGASTER GIGAS, new species 



Male. — Broadly oblong, vaguely narrowed in front and behind, 

 and feebly convex; head and antennae green, the latter with the 



