PTEROCHILUS. 369 



beneath, bright ferruginous; elypeus subconvex, sparsely punc- 

 tured, pubescent, the tip produced and truncate; mandibles 

 large, long, acute at tip, with four obtuse teeth on the inner 

 edge before the tip; the outer surface with two oblique carinae, 

 the lower margin fringed with long yellow hair; maxillae blackish, 

 their palpi fulvous, the apical joints fringed with very long hair; 

 antennae black, the two basal joints bright ferruginous. Thorax 

 very densely punctured, black, the upper half of prothorax, spot 

 beneath anterior wing, two large, almost confluent spots on 

 scutellum, and the sides of the metathorax, bright ferruginous : 

 post-scutellum and tegulae, except a central darker spot, yellow- 

 ish-ferruginous; metathorax short and very abrupt. Abdomen 

 robust, sessile, very densely punctured ; first and second segments 

 dull-ferruginous, with* their apical margins bright yellow, and a 

 larger black spot on their basal middle; that on the first segment 

 longitudinal and even, that on the second transverse, angular on 

 the sides and acutely pointed behind ; the yellow posterior margin 

 of the second segment is slightly and squarely emafginate on 

 each side anteriorly ; remaining segments bright lemon-yellow, 

 the third and fourth more or less black at base; the two apical 

 segments are tinged with orange and the third to fifth segments 

 have a transverse orange spot on each side ; beneath ferruginous, 

 with a lateral yellow spot at tip, and a large semicircular black 

 mark on the base of the second segment. Legs ferruginous; 

 coxae and trochanters black; the four posterior tibia? and base 

 of tarsi covered with short spines. Wings subhyaline varied 

 with fuliginous ; the costa and base stained with yellowish, sub- 

 violaceous. 



Hah. New Mexico (Museum of the Am. Entom. Society). 



2. Pt. MexicanilS Sauss. (Fig. 31, 31a).— Validus, niger, fulvo-liir- 

 sutus; ore, clypeo, macula frontali, orbitis partim, antennis basi, pro- 

 noto, lineis 2 mesonoti disci, tegulis, vnaculis pleuraruin, soutellis, 

 nietanoto ntrinque, pedilmsque rufls ; abdomine rufo, Begmentis ftavo- 

 limbatis, 1°, 20 nasi nigris ; alis infuscatis, violasoentibus. 9 . 



Pterochilus mexicanus Sauss. Rev. de Zool. XXII, 1870, 141, oti J. 



Total length, 16 nun. ; wing, 14 nun. 



?. Large. Labial palpi very large, ciliated with very long 

 black hair. Clypeus strongly punctured, truncate; its extremity 

 rather excavated in the middle, with oblique submarginal lateral 

 24 



