374 P. CAMKRON. 



Trypoxylon rufidens sp. nov. 



Black, densely covered with silvery pubescence, opaque ; mandibles, clypeus 

 and labrum bright rufous; the labruni ending in 2 stout, slightly divergent 

 teeth; metanotum not depressed, without a basal area; the basal part with a 

 stoutish keel which extends shortly beyond the middle ; the base has 2 or 3 

 oblique striae on either side of the keel; the rest closely, transversely striated ; 

 the striae distinct and slightly curved; the apical slope has 2 or 3 transverse 

 keels on the top. Propleurae weakly striated in the middle below; the meta- 

 pleuras strongly, closely and regularly striated ; the lower basal half bordered by 

 a stout, curved keel, which is slightly angled in the middle. Basal 3 segments 

 of the abdomen roundly dilated at the apex above; the basal segment is as long 

 as the 2nd and the half of the 3d. Tibial and tarsal spines whitish, tinged with 

 fulvous. Radial cellule short, the apical abscissa of the radius straight, oblique, 

 not quite twice the length of the basal ; the recurrent uervure is received from 

 the apex of the cubital cellule by slightly more than the length of the transverse 

 cubital nervnre. Hind ocelli separated from each other by double the distance 

 they are from the eyes. From nearly opposite the middle of the eye incision a 

 stout, curved keel runs to each antenna on the inner side; the antennas are 

 united by a strong transverse keel. Front ti bias broadly testaceous at the apex 

 in front. Length 7 mm. 



Hab. — Mexico. 



This species comes near to T. nigrispinis and T. rugifrons; these 

 may be known from it by the depressed base of metanotum, without 

 a longitudinal keel. Characteristic is the bidentate rufous labruni 

 of rufidens. 



Nysson longispinis sp. nov. 



Black, the tibiae and tarsi rufo-testaceous, the hind tibiae darker behind, the 

 apices of the basal 5 abdominal segments and of the 3d and 4th below much 

 more narrowly, rufo-testaceous, tinged with yellow; the thoracic, spine from 

 shortly beyond the middle rufo-testaceous. Wings hyaline, slightly suffused 

 with fuscous; the nervures black. J. Length 11-12 mm. 



Head and thorax densely covered with silvery pubescence ; a band of pale 

 golden pubescence on the base of the mesonotum and another down its centre. 

 Front and vertex rugosely punctured, the front more closely than the latter; the 

 keel above the antennae stout, longish. Clypeus alutaceous, its apex depressed, 

 brownish, not quite transverse. Middle of mandibles obscure testaceous. Meso- 

 notum with shallow, moderately large punctures. Scutellum irregularly longi- 

 tudinally striated, the parts between the striae depressed. Post-scutellum broadly, 

 roundly depressed in the centre, the sides being clearly, roundly raised and 

 distinctly separated from the scutellum. Metauotal spines curved, long, diverg- 

 ing, about twice as long as they are wide at the base. Metanotum areolated ; the 

 basal area?, much longer than wide, the apical wider compared with their length, 

 more irregular and with some striae in the centre. Propleurae above smooth, the 

 centre below with stout, clearly separated keels. Mesopleurae coarsely, irregu- 

 larly reticulated-punctured, the metapleurae more closely reticulated except at 

 the base. Basal segment closely, distinctly, the 2nd less closely and more ob- 

 scurely punctured, the other segments smooth. Pygidium fiuely rugose, irregu- 



