TEYPHON. — POLYBLASTUS. 287 



Antennae nearly as long as the body, covered with microscopic pile ; third joint more 

 than one half longer than the fourth. Head covered with pale pubescence, aciculated, 

 the face coarsely blistered ; clypeus not separated, without fovese ; eyes longish, oblong, 

 reaching to the base of the mandibles. Thorax finely punctured, covered with a close 

 pile; scutellum raised, shining, the sides keeled. Metathorax with eight areae; the 

 upper median area longish, slightly dilated a little beyond the middle, narrowed 

 towards the apex ; covered with rather long grey hair ; spiracles small, round. Petiole 

 slightly thickened towards the apex, keeled along the sides, the tubercles longish ; the 

 postpetiole a little narrowed in the middle. Legs moderately stout ; coxae, the base of 

 the hind trochanters, the hind femora (except the base and apex), and the hind tibia? 

 and tarsi (except at the base and apex), black. Areolet irregular, shortly petiolated, 

 longer than broad ; the nervures thick. 



3. Tryphon croceiventris. 



Tryphon croceiventris, Cresson, Trans. Am. Ent. Soc. 1868, p. 36 (d 1 ) 1 . 

 Hab. Mexico, Hacienda del Potrero, near Cordova l (Sumichrast). 



4. Tryphon (?) maculipennis. 



Tryphon (?) maculipennis, Cresson, Proc. Acad. Phil. 1873, p. 392 ( S $ ) *• 

 Hab. Mexico, Orizaba x (Sumichrast). 



5. Tryphon (?) laticinctus. 



Tryphon (?) laticinctus, Cresson, Trans. Am. Ent. Soc. 1868, p. 36 ( ? )*; Proc. Acad. Phil. 1873, 

 p. 392. 



Hab. Mexico, Hacienda del Potrero, near Cordova 1 (Sumichrast). 



POLYBLASTUS. 



Polyblastus, Hartig, Wiegmann's Archiv, 1837, p. 155. 



It is exceedingly doubtful if the species here described as a Polyblastus really belongs 

 to that genus ; the discovery of more specimens (I have only a mutilated male) will, I 

 believe, show that it should be made the type of a new genus. 



1. Polyblastus (?) aztecus. (Tab. XII. fig. 3, $.) 



Niger ; ore, facie, orbitis, linea pronoti, macula mesoscutelli, postscutello, maculisque 2 metanoti, flavis ; 



abdomine rufo, basi nigro ; pedibus anterioribus flavis, posticis nigris ; femoribua subtus basique tibiarum 



lsete, rufo-fulvis ; alis hyalinis, nervis nigris. <$ . 

 Long. 10 millim. 



Hab. Mexico, Northern Sonora (Morrison). 



Antennae covered (except the scape) with a microscopic pile ; thick (the apex is now 

 broken off, but, if my memory serves me correctly, it was much stouter than the base), 



