1920,] NATURAL SCIENCES OF PHILADELPHIA. 347 



and in the pygidium and forceps which, though of very similar 

 general structure, show important differences. The former being 

 merely subconical mesad in the convex area, the latter in having 

 the internal margins entirely unarmed distad. 



Type: cf ; Nouveau Chantier, French Guiana. August. [Paris 

 Museum.] 



Size medium, form moderately broad, for this genus which in- 

 cludes very small species. Head depressed and showing weak but 

 distinct depressions which run from .the eyes toward the middle of 

 the caudal margin of the occiput, cheek one and one-half times as 

 long as eye, caudal margin of occiput showing very broad and weak 

 concavity, sutures obsolete. Antennae with first joint twice as 

 long as distal width, other joints missing. Pronotum with length 

 equal to width, very slightly broader cephalad than caudad, showing 

 a weak medio-longitudinal sulcus and on the prozona a lateral 

 sulcus on each side; lateral margins very broadly convex and very 

 weakly convergent caudad, rounding broadly into the very broadly 

 convex caudal margin. Tegmina slightly over twice as long as 

 broad, caudal margin transverse. Wings fully developed, exposed 

 portion nearly half as long as tegmen. Abdomen with dorsal sur- 

 face poUshed and punctulate laterad except ultimate tergite which 

 is smooth, shows a very feeble median depression and has its caudal 

 margin transverse. Pygidium moderately declivent, surface con- 

 vex becoming subconical mesad with a minute medio-longitudinal 

 carina running down the caudal face of this production, lateral mar- 

 gins weakly convex, with a minute tubercle on each side just beyond 

 the median point where these margins no longer touch the forceps, 

 distal margin transverse, as broad as basal margin, with a small 

 rounded tooth at each disto-lateral angle. Forceps straight, slightly 

 divergent and weakly tapering in proximal half, with a few micro- 

 scopic tuberculations on the internal face opposite the pygidium, 

 inbent at end of proximal half, the distal half more slender but gently 

 swollen meso-distad, almost straight to the slightly incurved apices 

 and wholly unarmed. Penultimate sternite and tarsi wholly con- 

 cealed by mounting slip. 



Length of body 5.2, greatest width of head (across eyes) .9, length 

 of pronotum .75, greatest width of abdomen 1.5, length of forceps 

 1.3 mm. 



Head dull black, proximal antennal joints dresden brown. Pro- 

 notum shining blackish brown, broadly margined laterad and caudad 

 with translucent whitish. Tegmina shining blackish brown, show- 



