SOLENOSOMA. — ADIATHETUS. 141 



broad, narrower than the head anteriorly, as wide as the head 

 posteriorly ; posterior angles gently rounded. Elytra quite 

 smooth, red-brown. Legs testaceous. Abdomen parallel-sided, 

 finely punctulate, lateral tubercles distinct. Last dorsal segment 

 smoother than the abdomen, quadrangular, decidedly broader than 

 long, the hinder margin sinuate with a row of small compressed 

 tubei'cles. Pygidium small, thick and obtuse, with a short, narrow, 

 parallel-sided lobe terminating in two short sharp pomts. Forceps 

 with the branches remote at the base, depressed and slightly dilated 

 at the base itself, then attenuate, bent gently downwards and elon- 

 gate, very slender, almost straight, slightly converging and gently 

 hooked at the apex ; the inner margin near the base has a few 

 minute denticulations. The female is unknown. 



6 



Length of body 9-10 mm. 



„ forceps 4-5-G „ 



Assam : Silicuri, in Cachar (1 cJ, Tad. Mus.) ; Burma : Bhamo 

 (1 S ■, Genoa Mas.). 



Tyjye in Genoa Museum. 



This is a rare insect, and the two specimens, quoted above, both 

 males, are the only ones known to exist in collections. 



It can be recognized at a glance by its dark red chestnut colour, 

 elongate and slender build, the very long and slender forceps, and 

 the form of the elytra, taken in conjunction with the form of 

 the legs and pronotum, which show that its proper place is in 

 the Chelisochince. 



The type has only 11 segments left in the antennae, and the 

 specimen in the Calcutta Museum has lost both the antenuEe. 



Genus ADIATHETUS, Buvr. 



Adiathetus, Burr, (07^) pp. 126 & 132. 

 Chelisoches, Bonn., {OQi^) p. 82 (pars). 



Type, Chelisoches shelf ordi, Burr. 



Size medium or large. Antennae with 20 segments, the third 

 long, but shorter than the fourth and fifth united ; fourth half as 

 long as third, clavate ; fifth clavate, nearly as long as third; the 

 rest elongate, subcorneal. Head tumid, sutures distinct. Pronotum 

 nearly square, slightly wider posteriorly than anteriorly. Elytra 

 ample, with no keel on the costal fold, smooth or granuloue, 

 often metallic. Wings like the elytra. Legs rather slender ; 

 tibiae not flattened nor furrowed above except at the extreme apex. 

 Abdomen convex, parallel-sided, lateral folds distinct. Last dorsal 

 segment of c? ample, smooth, often with some strong tubercles ; 

 in the $ ample, simpler. Pygidium of 6 and $ various. Eorceps 

 of (S stout, depressed and broad ; of § elongate and less stout. 



lianc/e. Oriental Region. 



