_188 



of firsit abdominal segment smooth liehind the keel, the rest strongly 

 closely punctured, as are also tlie others excejyt the last. The trans- 

 verse keel on the first segment is stout, clearly raised, the second seg- 

 ment is distinctly longer than wide- The thorax is twice longtM- than 

 wide. 



Seen from, above the first ajbdominajl segment is broad and trans- 

 verse, shorter than it is wide at the apex. A longish, slenderly built 

 insect. Belongs to S1ciiancistroccrus- 



5205 Ancistrocerus trituberculatus sp. .onv 



Black; the sides of metanotium stoutly keeled; the clypeus, labrum, 

 a small round spot over the antennae, a short line on the lower edge 

 of the eye incision, a narrow line on the base of pronotum. a less 

 distinct one along its sides, two large almost continuous marks on the 

 apex of scutellum, two spots on the sides of the metanotum beliimi 

 the keel, a conical spot below the tegulae, a distinct line on the apices 

 of the basal two abdominal segments, a less distinct one on the third, 

 and the underside of the intiMinal scape, yellow- The underside of 

 the coxae, apical half of anterior femora, the middle more broadly and 

 the greater part of the four anterior tibiae, yellow. Wings fuscous- 

 violaceous the posterior pah/r, the costa and stigma black- Male. 

 Length 9_10 mm- Belize (,T. D. Johnson.) 



Clypeus longer than broad, very strongly punctured, the apex trans- 

 verse, with the sides very slightly projecting, the front and vertex 

 are as strongly but more clusely ])unctured. Occiput transverse, 

 sharply margined. Proand mesothorax, except the propleurae and 

 base of mesopleurae, strongly closely punctured; the base transverse, 

 keeled, not projecting laterally- Base of postseutellum r.aised, very 

 coarsely punctured, the rest smooth; the apex rounded, the smooth 

 part forming the segment of a circle, reaching to the top of the 

 metanotum, which is short, hollowed, smooth except for some obscure 

 striae, the sides rounded, yellow in the middle- Basal slope of first 

 abdominal segment closely transversely striated below, smooth above, 

 finely punctured at the base ami apex, smooth in the middle. The 

 second segment slightly wider than long, its apex distinctly incurved, 

 closely strongly punctured, the middle with a stout raised keel or 

 tubercle on the a]ncal two-thirds and a large rounded tubercle on 

 either side of it; the third segment is closely strongly punctured, its 

 apical half depressed; the othei segments are less strongly punctured, 

 the puncturation becoming gradually weaker, the pygidimn being only 

 sparsely punctiired; its apex is broadly rounded. 



The lower part of the pronotum projects, but not so much so as the 

 upper; tiie middle is therefore roundly hollowed- Metapleurae smooth, 



