Mr. A. White on a new species of Lonyicorn Beetle. 109 



they have been for a short or long time out of the pupa state ; 

 thry always keep to the ground and walk slowly. Amongst 

 the Prionidce this group, containing Dorysthenes, Cijrtuynathus, 

 Cacoscelis, and ]wrhii\>s Acanf/iinoderus, PsaIidognathusm\iX Prio- 

 nacahis, resembles in habit Dorcadion and allied genera among 

 Lamiache, as Gucnin-.Menevillc very justly remarks (/. c. ISIag. de 

 Zool., and Rev. Zool. Cuv. 1840, p. 39 Cyrtognatlms). I may 

 here add, that the curiously curved jaws and very strong legs with 

 their slender elongated tarsi seem to tit them particularly for 

 getting into the gi'ound, escaping from it and walking on its 

 surface*. 



In a small collection of insects from Mexico, purchased last 

 year by ^Ir. Gray for the British Museum from M. Hartweg, 

 there are three specimens of a subgenus of Prionido', at first 

 sight with veiy considerable resemblance to the Psalidoynuthus 

 modestus, Fries, Vetensk. Akad. llandl. 1833, p. 327. t. 9. f. 3, 

 agreeing with that species in many particulars, but to me appear- 

 ing distinct. 



From the genus Psalidognathiis of Mr. George Gray (Griff. A. 

 K., Insects, ii. p. 115. t. 6. f. 14), as characterized both by Mr. 

 Gray and ^I. Fries, it differs in many particulars, sufficient, if 

 the established subgenera of Prionida be valid, to constitute a 

 new subgenus closely allied to Psalidognatlius : in my description 

 any comparisons refer to this latter genus. 



Prionus, subg. Prionacalus, White. 



(? . Head behind the eyes w ithout a prominent spine ; the la- 

 teral margin behind produced into a sHght process directed back- 

 wards. 



$ . Head midway between the eyes and the posterior edge, 

 with a strong broad spine on each side. 



cJ ? . Cheeks where jaws are inserted, without strong tooth on 

 the outside. (See PL \'1II. fig. 1 b.) Labium very short (in Psa- 

 lidognathus the labium is elongated). 



Jaws very strong (in female widest), with the upper surface 

 rounded, the ends bent downwards, the edges strongly toothed 

 and notched, the terminal tooth fitting into a groove in the other, 

 and the ends proljably lapping over each other. 



Pal|)i very prominent (PI. \'ni. fig. 1 c c and 2ab). Alaxillary 

 with terminal joint largest, securiform and much dilated, penul- 

 timate joint much shorter than the third. Labial palpi with the 

 terminal joint much dilated. Antennae 1 1 -jointed, with fu-st joint 



• The Euchroa dimidiata of Guerin-Meneville, Delessert, Voyage, p. 57. 

 1. 14. f. 1, and Mag. de Zool., is the iVirtrw* /mo/or of Newman, Mag. Nat. 

 Hist. iv. 191 ; tlie original specimens, from Mr. Children's collection, are in 

 the British .Mnseum. 



