34 HY.MEXOPTERA OF AMERICA. [PART I. 



a little more elongate; its angles very prominent; the post- 

 scutellum quite destitute of a spine. Metathorax triangular, not 

 car mated and not so rough. Petiole a little less cylindrical, a 

 little more swollen, coarsely cribrate ; the beginning of the 

 swelling punctate like the rest, not polished (as if smelted) as in 

 spinosus; 2d segment less globular, more pyriform, only punctate 

 along its margin. 



The ornaments more numerous than in spinosus, having a spot 

 on each side of the clypeus, two on the face, the scape beneath, 

 the border of prothorax, a macula under the wing, edges of the 

 tegukc, an interrupted fascia on the scutel and on the post-scut el, 

 two maculae on the metathorax, margin of petiole and a submar- 

 ginal line on the edge of the 2d and 3d segments, yellow. The 

 rest of the abdomen brownish; an abbreviated yellow fascia on 

 the intermediate tibiae. Wings hyaline, a little brownish along 

 the anterior margin ; the 2d cubital cell not anteriorly contracted, 

 having a distinct radial border. 



Bess. a. cliff. — This species slightly resembles Montezumse but 

 is very distinct by the rest of its coloration, by its swollen, not 

 depressed, and more coarsely cribrose petiole ; and by the second, 

 more globular, less elongate segment of the abdomen. 



It differs from aztecus and Westwoodi by its more sessile 2d 

 segment, its more coarsely cribrose and more cylindrical petiole, 

 its maculated metathorax, without excavation, only parted by a 

 sulcosity; smaller head, rough clypeus, etc. 



It is nevertheless an embarrassing species, intermediate between 

 spinosus and Montezumae. 



Hob. Mexico; the Oriental Cordillera (Mr. Sumichrast). 



21. Z, clypearis n. sp. — Niger, crassissime dense cribrato-pnnctatns ; 

 pronoto acute angnlato; metanoto 4-carinato, post-scutelli an gal is 

 dentiforraibus; petiolo ovato tumilo; punctis 2 frontalibus, pronoti 

 margine, punctis 2 scutelli et 2 post-scntelli margineqna petioli, flavis ; 

 margine 2' et 3' 1 segoienti sinuato, liuea prsewarginali flava; alis 

 fumosis. % . 



Total length, 13 mm. ; wing. rum. 



Form and punctures as in Z spinosus. The head very little 

 wider than the thorax; the thorax short, crested in front, very 

 square anteriorly: its angles sharp, a sort of crest bordering the 

 sides of pronotum up to the wing-scale. Scutel rather salient; 



