UIILER ON INSECTS. 367 



B. Head destitute of sabinargiiial teeth : 



Ostiolar canal fasiform, rather flat, traiisversly iucised next 



the tip ; pronotum with an impressed siuuated antero- 



marginal line Pangwus. 



Ostiolar canal long, spatulate, but broad and rounded at 



tip ; pronotum without the sinuated line Melancethus. 



Ostiolar orifice at the inner end of an oval scale, which is 



placed, exteriorly on the episternum Lohonotus. 



Cyrtomenus Amyot & Serv. 



Form ovalj deep, very convex in all its diameters. Head strongly 

 clypeate, the cheeks lamellate, bilobate, with the margin abruptly re- 

 curved; the submargin with comb-like, erect teeth, and with long, 

 remote bristles ; the surface obliquely ridged and grooved, and the 

 ocelli large; second joint of antennae much shorter than the third, 

 fourth and fifth stouter, ovate, moniliate. Pronotum transverse, strongly 

 convex, with the lateral margins recurved, the anterior submargin with 

 an arcuated, abbreviated impressed line, in front of which the margin is 

 thick and raised ; a transverse deeply impressed line on the middle, 

 abbreviated near the margins, divides the surface into two almost equal 

 parts. Prosternal flaps lamellar, high, lunate ; odoriferous canal not 

 half the length of the episternum, fusiform, with a small auriculate 

 appendix at the tip ; tibi?e all compressed and distinctly curved, the 

 spines and teeth of the outer surface stout, and the latter set in promi- 

 nent wavings of the surface; interior margin of the anterior coxae prom- 

 inently, archedly carinate. Scutellum convex, a little longer than wide, 

 a little contracted at tip, but not narrow, bluntly rounded. Corium 

 wide, blunt, obliquely subtruncated on the posterior margin, the costal 

 margin broadly curved, the edge thick for more than half its length, 

 ciliated ; epipleura wide, a little more than one-half the length of the 

 corium, longitudinally scooped out, suddenly narrowed before the tip, 

 the tip slender, acute. 



1. C. niutahilis. 



Cijdnus mutahilis Perty, Delectus Anim., art. 33, fig. G. 

 Ciirtomenm castanevs Amyot & Serv., Hemipt., 91, No. 1. 



Chestnut-brown, or rufo-piceous, obese, suborbicular, bristly about 

 the sides, on the margins, beneath, and on the legs and rostrum ; the 

 surface smooth and highly polished. Head semicircular, emarginated 

 in front, paler anteriorly, the surface uneven, with a few irregular, in- 

 dented points, and on each side with a series of oblique ridges and de- 

 pressed lines between them ; the lateral lobes broadly depressed ante- 

 riorly, with the margins strongly recurved and ciliated with ferruginous 

 bristles, their interspaces with indented points; tylus shorter than the 

 lateral lobes, tapering toward the tip; base of head tumid, highly pol- 

 ished, minutely and obsoletely wrinkled and punctured ; ocelli very near 



