390 ^'^s Philippine Journal of Science wis 



hyaline, base and apex punctate black, anterior horns reversed, compressed, 

 recurved.) 



Body and prothorax brown; horns compressed, directed forward, their 

 extremities recurved; posterior spine shorter than abdomen; sides of breast 

 white; on the front of the prothorax two lines between the horns and 

 the head of an indistinct gray; legs ferruginous, knees clearer; elytra 

 hyaline, with a brown spot at the base and at the extremity. 



Centrotus dilatatus Walk. 



Centrotus dilatatus Walk., List Hom. Brit. Mus. (1851), 630. 



Centrotus dilatatus was described from a single specimen of 

 which the head was missing. The description lacks the details 

 necessary for present generic determination and is as follows: 



Brown, clothed with dingy tawny hairs; head wanting; fore-chest very 

 broad, indistinctly ridged, low in front ; shoulders flat, conical, very 

 prominent; horns above compressed, angular, extremely short; hind ap- 

 pendage very short, triangular, keeled, impressed on each side near the 

 base, not extending much beyond the base of the abdomen; fore-wings 

 grayish, ferruginous at the base; veins ferruginous, nodose. Length of 

 the body Ih line; of the wings 3 lines. 



a. Philippine Islands. From Mr. Cuming's collection. 



It should be noted that the length of the wings as given above 

 was used by Walker to refer to the distance between the tips 

 of the tegmina when spread at right angles to the body. The 

 measurements as changed to millimeters then become: Length, 

 3.16 mm. ; width of outstretched wings, 6.33 mm. 



The description suggests a small Tricentrus, but since the 

 recognition of genera and species in this group depends largely 

 on the shape of the clypeus, the relative position of the ocelli 

 and the eyes, the apical areas of the hindwings, and the structure 

 of the scutellum the description of a headless specimen in the 

 discussion of which neither the scutellum nor the hindwings are 

 mentioned lends itself poorly to purposes of identification. 



Centrotus orcus Buckt. 



Centrotus orcus Buckt., Mon. Memb. (1903), 247, PI. 60, figs. 7, 7a, 7b. 



No data concerning Centrotus orcus are available, except Buck- 

 ton's description which is here quoted verbatim: 



General form robust and broad between the shoulders. Suprahumerals 

 short, connate and stout. Pronotum narrowed to a short almost stylate 

 posterior horn. Colour sordid olive-green, with ochreous tips to the tegmina. 

 Frons and metopidium hirsute. Legs olive. Tegmina with five distinct 

 apical and three discoidal areas. 



Size, 5x3 mm. Habitat — Philippine Isles. 



