272 M. H. Jekel — Tentccmenta £/ntomohgica. 



Pachytycldus elongatus, Sch. 

 (S . Rostro paulo breviore et crassiore, minus arcuato, lateribua magia 

 ampliato. — Long. 5|-7, latit. 2^2h millim. 



PachytycMus leucohma, (Dej.) Jekel. 

 This is evidently distinct from elongatus, Sch. ; and Dejean had 

 sejmrated them in his collection. It is more than tAvice smaller 

 (long. 4|-4|, latit. IfV"! n7 i^iU-)- Rostrum proportionally longer 

 and thicker, more arcuate. Thorax much less transverse, evidently 

 much longer, less ampliate at the sides, nearly subquadrate, with 

 the punctures deeper, broader, much less numerous. Elytra with 

 deeper striae, coarser rugosities on the interstices. Body underneath 

 much more coarsely punctate-rugose. 



The specimens from Algeria, which M. Lucas regards as belonging 

 to Tychius elongatus, reallj' constitute a distinct species, which I had 

 long labelled in my collection under the name of 



PacJiytycJiius Lucasii, Jekel. 



This species approaches nearer to leucohma in size (although 

 generally larger) and shape of thorax, but is readily distinguished 

 from both species by having much shorter elytra ; the antenna} are 

 thinner, and of a light rufous colour. In the configuration of the 

 elytra it stands nearer to licematocephalus* , from which neverthe- 

 less it is distinct by its less convex thorax, the broadest portion of 

 which, as in the above two species, is much nearer to its apex. Like 

 the three species here mentioned its posterior thigh is dentate, but 

 more obtusely. 



I have seen fresh J specimens of Tych. liaimatocephalus from the 

 Basses Alpes which have the scutellum whitish squamose, like ru- 

 bricejos, Eosenh. Are the two distinct ? 



Sibynes sellatus, Lucas, from Algiers, is another species of this 

 group, nearly alhed to the four preceding, and having, like them, the 

 elytra conjointly rounded at the apex, covering the pygidium entirelyf, 

 and the posterior thighs obtusely dentate. It is a very pretty species, 

 having the design of its elytra very similar to that oi Baridius sellatus, 

 Sch., from the same country. 



* I have seen small specimens of this species confounded with haviatocephalus 

 in some collections. 



t The vai-iable shape of the body and of the joints of the antennae in Tt/chius 

 pr. d. (as I actually limit it) and in Sihyiies reducing the nmnber of their distinct- 

 ive characters as established by Schonherr and subsequent authors, there remains 

 only the difference in shape of the base of the thorax (sometimes very slight) and 

 the more evident one of the apex of the elytra— viz. singly rounded, leaving the 

 pygidium evidently exposed, in Sibynes — to distinguish the two groups. 



