268 CURCULIONIDES. 



2. G. OPERCULATUS. — Rostrum obsoletely truncated ; a frontal 

 dilated puncture. 



Inhabits Mexico. 



Body black, covered with minute, orbicular, perlaceous scales ; 

 head with a dilated impressed puncture between the eyes, an ob- 

 solete longitudinal sulcus on the short, robust rostrum and a still 

 less obvious one on each side ; thorax canaliculate in the middle ; 

 elytra with series of rather large impressed punctures : thighs 

 with a sinus beneath near the tip. 



Length over seven-twentieths of an inch. 



DERACANTHUS SchiJnh. 

 Subgenus Aracantiius. 

 D ? PALLiuus. — Body whitish, varied with pale brown ; rostrum 

 not longer than broad, with an impressed, very obvious line from 

 the vertex to the tip : eyes small : thorax with numerous, small 

 punctures not close set nor very regularly placed ; base not un- 

 dulated : elytra with regular strias of punctures. 

 Inhabits United States. 

 Length over one-tenth of an inch. 



THYLACITES Germ. 



1. T. MICROPS. — Body whitish : rostrum very short and broad : 

 eyes very small, orbicular ; front with an acute impressed line : ver- 

 tex and thorax a little rough with numerous slight indentations ; 

 scutel not obvious : elytra with their stria) and punctures not 

 visible, suture a little elevated : feet simple. 



Inhabits Missouri. 



Length less than three twentieths of an inch. 



[This is T. microsHs Sch. — Lec] 



Subgenus Strophosomus Sch. 



2. T. TESSELATUS nob. (Liparus) Jour. Acad. Nat So. 



CALLOPISTUS Schonh. (in litt.) 



B. AURICEPHALUS nob. (Curculio) Jour. Acad. Nat. Sc. 

 vol. 3. p. 310. 



[Is Plati/omm auriccps Sch. — Lec] 



