THYLACOSTEENTJS. 257 



THYLACOSTERNUS. 



Thylacosternus, de Bonvouloir, Mon. des Eucnemides, p. 855 (1870). 



The species of this genus have a peculiar facies, owing to their elongate parallel 

 form, recalling Hyleccetus. 



1. Thylacosternus rubricollis. 



Thylacosternus rubricollis, de Bonv. Mon. p. 863 \ 



Hah. Mexico, Cordova (Salle *), Teapa in Tabasco (H. H. Smith). 



Black ; thorax, middle of the metasternum, and femora pale orange-yellow ; elytra 

 striate at the base. 



2. Thylacosternus bifasciatus. 



Thylacosternus bifasciatus, de Bonv. Mon. p. 869 l . 

 Hah. Mexico, Playa Vicente (Salle x ). 



Similar to T. rubricollis, but with the occiput also pale ; legs entirely yellowish ; each 

 elytron with a pale stripe from the humerus to the apex. 



3. Thylacosternus nigrinus. 



Thylacosternus nigrinus, de Bonv. Mon. p. 864, t. 42. fig. 2 1 . 

 Hal. Mexico 1 , Cordova (Salle). 



Entirely black, except the anterior angles and underside of the thorax ; legs yellowish, 

 the tibia? piceous. 



4. Thylacosternus donatus. (Tab. X. fig. 25.) 



Similar in form to T. rubricollis : antennae black ; head densely and coarsely punctate, vertex slightly concave - T 

 thorax broader than long, sides parallel, rounded at the front angles, disc moderately convex, closely 

 punctate, median line slightly impressed from the base to the middle, where there is a shallow fovea, a 

 vague transverse depression at the middle of the declivity, colour reddish-yellow, with two quadrate 

 piceous spots, the anterior large, contiguous to the apex, the other smaller, contiguous to the base, these 

 separated at the central fovea, surface sparsely fulvo-pubescent ; elytra striate, except at the apex, the 

 stria? vague, but deeper at the base, intervals slightly convex, more distinctly near the base, densely 

 punctate, somewhat roughly at the base, surface sparsely clothed with short, black, erect pubescence ; 

 body beneath, except the prothorax, black, moderately shining, abdomen closely punctate, cinereo-pubes- 

 cent ; legs piceous-black, the anterior and middle femora at the base and their coxae yellowish, tarsi pale. 



Length 7*5 millim. 



Hah. Mexico, Coahuila (from my cab., Br. Palmer). 



This species is evidently related to T. pulchellus, but with a differently impressed 

 thorax and more distinctly striate elytra. 



[N.B.— This page was published in November, 1890, and is now reprinted.— Edd.] 



biol. CENTR.-AMEE., Coleopt., Vol. III. Pt. 1, October 1894. 2 L 



