OF NATURAL HISTORY. 665 



line : elytra with a dull [ 195 ] honey-yellow vitta, external edge 

 and obsolete spot on the basal middle : postpectus sericeous : feet 

 honey-yellow ; tip of the posterior thighs, their tibijB and tarsi 

 dusky : abdomen honey -yellow. 



Length % nearly three-fifths of an inch ; 9 over four-fifths. 



In the form of the thorax it is more like M. himaculatus nob., 

 than marQuialis, but it is greatly superior in magnitude to either, 

 and very distinct as a species. 



ACANTHOCINUS Meg. 



A. QUADRIGIBBUS. — Antennae annulate ; thorax four tuber- 

 cled ; elytra with a cinereous spot on each. 



Inhabits Louisiana. 



Body dark brownish, when closely examined, varied with fer- 

 ruginous and cinereous, short, prostrate hair : antennae hardly 

 longer than the body, blackish; the joints, excepting the basal 

 ones, reddish cinereous at their bases ; basal joint clavate : head 

 before remotely punctured ; behind the eyes, small, numerous 

 punctures : labrum dull honey-yellow : thorax with distant punc- 

 tures ; four tubercles nearly in a transverse line, and a longi- 

 tudinal, elevated line : elytra quadrigibbous at base ; inner 

 gibbosity extended into a longitudinal elevated line, gradually 

 declining and terminating before the tip ; numerous, distant, pro- 

 found, punctures ; a dilated, undulated, cinereous spot, before 

 the middle ; a sutural series of alternate, quadrate, small brown 

 and cinereous spots, nearly opposite; tip emarginate: thighs 

 clavate. 



Length less than three-fifths of an inch. 



For an opportunity to described this species, I am indebted to 

 Mr. Joseph Barabino, who obtained it near New Orleans. 



[Belongs to Acanthodercs. — Lec] [196] 



TETRAOPES Schonh. 



T. TORNATOR Fabr. — This species is subject to vary. I ob- 

 tained an individual near the Rocky Mountains, so covered with 

 short whitish hair as almost to conceal its color; it was destitute 

 of the large black spot of the elytra. Two specimens occurred 

 in Mexico, both of which were destitute of the same spot. It 

 is the T. tctroj'thalmus Forster. 

 1835.] 



