PTEROCIIILUS. 369 



beneath, bright ferruginous ; clypeus 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 carina?, 

 the lower margin fringed with long yellow hair; maxilla? blackish, 

 their palpi fulvous, the apical joints fringed with very Ion"- 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 tegula?, 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; 

 coxa? 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. 



Hab. New Mexico (Museum of the Am. Entora. Society). 



2. Pt, HexicanMS Sauss. (Fig. 31, 31a).— Validus, niger, fulvo-hir- 

 sutus; ore, clypeo, macula frontal), orbitis partirn, antennis basi, pro- 

 noto, lineis 2 mesonoti disci, tegulis, maculis pleurarum, scutellis, 

 metanoto utrinque, pedibusque runs ; abdomine rufo,' segrnentis flavo- 

 lirabatis, 1°, 20 basi nigris ; alis infuscatis, violasceutibus. 9 . 



PterocJiJlus mcxicamis Sauss. Rev. de Zool. XXII, 1870, 141, 36 9- 



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



9. 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 



