132 May 



NOTE ON THE GENUS CARIDOPETRALMUS, ASSM. 

 BY E. BEEGROTH, M.D. 



In the "Amtlicher Bericlit der 50 Y ersammlung deutsclier Xatur- 

 forscher und Aerzte in Mtiuclien, 1877," p. 1 91, Herr A. Assmanu has 

 described a remarkable new genus and species of Pentatomidoe from 

 New Guinea, under the name of Garidopthahnus sexspinosus. Prom 

 the description given it was not difficult to guess that this insect 

 belonged to the anomalous genus Allocotus, Mayr, and this conjecture 

 I find to be correct, after having received from the author a more 

 complete description and a drawing of the species. It is well distin- 

 guished from the other three species hitherto known, being structurally 

 allied to A. Sayeri, Dist., but in colour more resembling A. Mayri, 

 Sign. As to the generic name, that proposed by Herr Assmann must 

 stand, Allocotus being pre-occupied. New Gruinea and the adjacent 

 islands seem to be the proper home of this genus. Mr. Distant speaks 

 of " the Australian A. Royenhoferi, Mayr," but no species of the genus 

 have been found in Australia, the species of Mayr being described 

 from Timor. As the description in the " Amtlicher Bericht " is very 

 succinct, and almost inaccessible to Entomologists, I think it useful to 

 give a reproduction of the complete description forwarded to me by 

 Herr Assmann. 



" Length, 5a mm., breadth, 3i mm. Head, ^ mm. long, I5 mm. broad; the 

 sinuated broad front bears two straight, porrect, acute spines of \ mm. length. The 

 eyes are inserted on a comparatively thick cylindrical process, which is directed 

 forwards and outwards. On the under-side between the spines and the ocular pro- 

 cesses the antennae are inserted. The Ist joint is short and thick, and only little 

 projecting between the two processes on each side ; the 2nd joint is stout, cylindri- 

 cal, 1 mm. long ; the 3rd joint is the longest, 3 mm., and has scarcely half the 

 the thickness of the 2nd joint ; the 4th joint is as thin as the 3rd, 2 mm. long ; the 

 5th, \\ mm. long, somewhat thicker, rounded at the apex. Thorax 2 mm. long, in 

 the front as broad as the head, behind 31 mm. broad ; before the middle of the ex- 

 ternal margin is an almost horizontal, finely pubescent spine of 1 mm. length ; more 

 hindwards, at the greatest breadth of the thorax, is another spine, which is somewhat 

 broad at the base, and has the tip curved back ; between the two anterior spines is 

 a tolerably stout transversal callosity, and the hind-margin of the thorax is likewise, 

 but not so strongly, callous. Scutellum 2^ mm. long, and at the base nearly 2 mm. 

 broad, obtusely acuminated at the apex. Corium, at the lateral margin, 3^ mm., 

 at the internal margin nearly 2\ mm. long, with the internal angle only little before 

 the tip of the scutellum. Membrane exactly reaching the end of the abdomen, 2 5 

 mm. long, with six strongly elevated, somewhat curved, longitudinal veins. The fore 

 and middle legs of the same length (the hind legs are wanting) ; coxae short, femora 

 a little beyond 2 mm. long, tibiae thinner, 2 mm. long, tarsi with strong fastening 

 lobes, I mm. long. Sternum, head, thorax and scutellum coarsely punctured, corium 



