104 TRANS. ST. LOUIS ACAD. SCIENCE. 



very polymorphous one, and comprises very discordant materials. 

 No less than 99 British species are referred to it by Westwood. 

 (Synofis. p. 47.) The bulla? are noticed under the same species 

 which I possess. Those of seminiger, Cress. 2 are B, C, D and 

 E, C and D not so widely separated. 



TryphOIl UtriCOXUS, n. sp. — 9 ?.— Black. Head subpolished, with fine, 

 confluent punctures, minute and sparse on the vertex and clypeus. Face, 

 but not the cheeks, a little prominent on the disk. Anterior \ of the cly- 

 peus, mandibles except their teeth, and palpi, pale rufous. Antennae § as 

 long as the body, brown-black, the scapus and part of the 1st joint of the 

 flagellum covered beneath with long, whitish pubescence; 1st joint of fla- 

 gellum 2\ times as long as wide. Thorax subpolished, with fine, dense, 

 confluent punctures — finer, shallower and more sparse on the pleura. Scu- 

 tel elevated, its sides carinate, loftily towards its base, its anterior surface 

 flattish. Metathorax coarsely rugose, the normal carina; all present, the 

 central area small and \ wider than long. Tegular yellowish-brown. Ab- 

 domen depressed, oval, with the 1st joint subpolished and finely rugoso- 

 punctate, £ longer than wide, £ wider behind than before, its sides straight 

 save a rounded tubercle at each anterior angle, and a smaller acute one 

 bearing the spiracle at § of the way to the tip ; the two dorsal carina? acute 

 and attaining the tip where they unite. The remaining joints subopaque 

 except towards the tip, with minute, shallow, rather sparse punctures. 

 Joint 2 with a basal and medial tubercle, each not far from the lateral edge. 

 Joint 1 coal-black; joint 2, and the basal § of 3, rufous; the rest blackish. 

 Venter dull pale rufous, obfuscated at tip. Legs rufous, moderately slen- 

 der, the coxae and the basal trochanters of all the legs black. Wings sub- 

 hyaline; veins black ; stigma black, basally whitish. Radial area rather 

 short, its posterior angle about 115 . Areolet small, triangular, obliquely 

 elongate, and with a short petiole. Bulla; 5, A on the petiole, B normal, 

 C and D widely separated, and E longer than usual and almost touching 

 the angle of its vein. Length ? ? .20 inch. Front wing ? ? .17 inch. 



One rJ ; 2 unknown. Belongs to Mr. Cresson's 4th Section. 

 Distinct from americanus, Cress, cf, affinis, Cress. 2 (which is 

 apparently the other sex of americanus), seminiger, Cress. 2, 

 semirufus, Cress. 2, analis, Cress, cf, festivus, Cress, cf, cinctus, 

 Cress, cf (Cuba), and claviventris, Cress, cf (Cuba), by the col- 

 oration of its abdomen ; from tibialis, Cress, cf by the hind legs 

 not being annulate with black and white ; and from rufodnctus^ 

 Cress. 2, minimus, Cress. 2, cafiilatus, Cress, cf, exiguus, Cress. 

 2 (Cuba), UneolaHis, Brulle 2 (S. A.), and mesoxanthus, Bridle" 

 2 (S. A.), by the coloration of the legs and the areolet not being 

 obsolete. 



[This is probably only a variety of T. dimidiatus. — Cress.] 



