110 Mr. A. White on a new species of Longicorn Beetle. 



scabrous and much thickened at the end, second joint puncti- 

 form, third joint as long as the fourth and fifth together. 



Elytra covering the abdomen, margined ; sides at the base 

 with a curved, somewhat hooked angle near the base ; the lateral 

 margins bulge ; elytra very short in the male compared with those 

 of the male of Psalidognathus, apparently soldered along the 

 suture, and both sexes seem to be apterous. 



Legs of the male with the tibia and femur nearly equal in 

 length and very similar in general thickness ; inside of the tibiae 

 flat and hairy. In the female, the legs, especially the femora, are 

 very large, strong, and cotnpressed ; the tibiae at the end 2-spined; 

 tibiae of fore-legs rounded above, inside flat and hairy, angular 

 beneath, and deeply notched or sinuated at the end ; tarsi of hind- 

 legs most elongated. The species I have named 



Prionus {Prionacalus ^) Cacicus, White. 



Niger, antennis pedibusque rufis. 



Hab. Mexico. ^ ? (PI. VIII. fig. 1, 2.) in Mus. Brit. (Theod. 

 Hartweg) . 



In the male the antennae, palpi and legs are rufous ; the first- 

 mentioned are blackish at the base. Jaws, excepting at the end 

 and on the edges (where they are smooth), roughly punctured. 

 Head, thorax and elytra at the base somewhat roughly punctured, 

 the elytra becoming more delicately punctated towards the end. 



In the female the antennae at the ends, the palpi, tibiae at apex 

 and the tarsi are ferruginous ; head with the two keels above the 

 eyes shorter. Head, thorax and elytra very roughly vermiculated 

 and dotted, and with a slight shining metallic lustre. 



M. Fries, in his memoir on Psalidognathus in the ' Vetensk. 

 Akad. Handl. 1833,' p. 327, has described under the name of 

 P. modestus what appears to be decidedly a second species of the 

 subgenus above described f. He characterizes it as follows, and on 



* The latter part of the name is the generic name applied by the late 

 lamented Dalman to the form previously described by Mr. G. R. Gray as 

 Psalidognathus : his species, Psal. superhus, seems to be distinct from the 

 P. Fnendii of Mr. Gray. M. Nisser in 1827 sent fom* specimens from Sant 

 Remedios to the Stockholm Academy, and Dalman named the species 

 Acalus superhus, but was prevented by death from describing it ; the name 

 Jcalus has been preoccupied, otherwise I would assign it to the subgenus. 

 P. superhus seems to me to be the P. Friendii, var. viridis, of French authors, 

 which has a comparatively shallow groove between the antennae, and has the 

 tibiae in the male much more dilated, as well as other characters, which we 

 have not space to give here. Specimens of both are in the British Museum ; 

 Mr. G. Gray's type specimen of P. Friendii from Mr. Children's collection, 

 and specimens of P. supei'hus from the collection of M. Buquet. 



t I am indebted to the obliging kindness of Mr. Jones, an assistant in the 

 library of the British Museum, for translating mc the memoir from the 

 Swedish. 



