GENUCHINUS.— CEEMASTOCHILUS. 375 



guish Genuchinus from Psilocnemis. Both agree in the rounded outline of the thorax, 

 and apparently in the flattened form of the mentum. 



Three species were described by Westwood from Ecuador and Mexico. 



1. Genuchinus v-notatus. (Tab. xxiii. fig. 14.) 



Genuchinus v-notatus, Westw. Thesanr. Ent. Oxon. p. 24, t. 10. fig. 4 1 . 



Hab. Mexico 1 , Cordova (Salle), Jalapa, Trapiche (Edge); Nicaeagua, Chontales 

 (Belt) ; Costa Eica, Cache (Rogers). 



A good series of examples has been received from Herr Hoge. In all the thorax is 

 polished and sparsely punctured. 



2. Genuchinus velutinus. 



Genuchinus velutinus, Westw. Thesaur. Ent. Oxon. p. 25, t. 10. fig. 5 \ 

 Hab. Mexico (mus. Parry l ), Amula in Guerrero (H. H Smith). 



Distinguished from the preceding by its opaque and closely punctulated thorax. 

 The punctures in two male examples recently captured by Mr. Smith are circular or 

 ring-shaped, with the rings mostly open posteriorly, and the interstices between the 

 rings are, in part, minutely granulated. 



CREMASTOCHILUS. 



Cremastocheilus, Knoch, Neue Beitrage, p. 115 (1801); Burmeister, Handb. der Ent. iii. p. 678; 

 Horn, Proc. Am. Phil. Soc. 1879, p. 382. 



A genus, so far as at present known, peculiar to North America, with its southern 

 limits in Mexico. Deducting the numerous synonyms recently detected by Dr. Horn, 

 the described species number twenty-three. 



1. Cremastochilus saucius. 



Cremastochilus saucius, Lee. Jonrn. Acad. Phil. iv. p. 16 (1858) ; Horn, Proc. Am. Phil. Soc. 1879, 

 p. 386 1 ; Trans. Am. Ent. Soc. 1885, p. 126, t. 4. fig. 3. 



Hab. Noeth Ameeica, Kansas to Texas 1 .— Mexico, Durango city (Hoge). 



A single example supplied by Herr Hoge agrees well with Dr. Horn's descriptions 

 and figure, the only difference observed being the longer and more spiniform (straight) 

 tooth at the base of the thorax near the hind angle. 



2. Cremastochilus planatus. 



Cremastochilus planatus, Lee. New Spec. Col. i. p. 81 (1863) ' ; Horn, Proc. Am. Phil. Soc. 1879, 

 p. 386, t. 4. fig. \\ 



Hab. Noeth Ameeica, California \ Arizona 2 . — Mexico, Northern Sonora (Morrison). 

 One example only of this distinct species was received from Morrison. 



