OF BRACHELYTRA. 195 



Antennae 11-jointed, filiform, with the basal joint robust, subclavate, 

 second twice as long as the third, from this to the eleventh equal, 

 eleventh longest, acute or obliquely truncate at the apex : maxil- 

 lary palpi (Fig. d 1) long, 3-jointed, basal joint minute, and the 

 terminal conic, acute : labium (Fig. b 2) oblong, membranous, 

 and retractile, furnished at the anterior angles with two very long 

 filaments : mentum (Fig. 6 1) quadrate, a little narrowed in front, 

 with two long bristles near the middle of the anterior margin, and 

 the angles produced into two long obtuse filaments, sparingly 

 clothed with long sets : labrum (Fig. c) somewhat oval, anteriorly 

 truncate : mandibles (Fig. a) robust, acute at the tip, and furnished 

 on the inside with a large, flat, transparent appendage, with its 

 inner margin straight and very finely serrated, with the tip acute 

 in front and rounded behind : the external lobe of the maxillae 

 (Fig. d 2) very slender, with a few setae at the tip : the internal lobe 

 (Fig. d 3) long, acute at the tip, horny, with the inner edge finely 

 denticulated from the middle : head produced in front, rostriform, 

 with the clypeus terminating in an acute point between the an- 

 tennse : eyes small : thorax transverse or quadrate : scutellum 

 short, concealed by the thorax : abdomen attenuated, with the 

 apex generally acute : legs rather long, with the four anterior 

 tarsi only 4-jointed (Fig. e), and the posterior (Fig. /) 5-jointed. 



A. With the thorax much broader than the abdomen. 



Sp. 1. Cen. Conuroides. (Fig. 1.) 



Rather broad, black, covered vtith a short sericeous pubescence : 

 mouth testaceous : thorax convex, narrowed anteriorly, the poste- 

 rior margin sinuated, with the angles acute : elytra deeply notched 

 at the posterior angles : abdomen nearly three times as long as the 

 elytra, strongly margined, and considerably attenuated, with the 

 apical half of the terminal and penultimate segments fuscous, the 

 penultimate delicately edged with white : legs piceous : antennae 

 and palpi black, with the basal joint of each testaceous. (Long, 

 corp. 1| lin.) 



Taken near Weston; February and March, 1837. 



Sp. 2. Cen. attenuata. 



Black, head broad at the eyes, and very much pointed towards the 

 mouth, which is testaceous ; thorax not narrowed in front, with 

 the anterior angles rather acute : elytra not broader than the 

 thorax, slightly notched at the posterior angles : abdomen rapidly 



h 



