1897.] NATURAL SCIENCES OF PHILADELPHIA. 385 



or folds, deeply impressed down middle ; the anterior ocellus is placed 

 in this furrow, which becomes shallower below and terminates in a 

 flat projection over the bases of antenna;; first joint of flagellum a 

 little shorter than the two following united ; clypeus not carinated, 

 prominent and rounded at apex ; thorax finely punctured, nearly 

 smooth ; tegula; testaceous ; middle segment above parted by a deep 

 furrow, which is transversely striated, and on each side of which 

 another less distinct, curved furrow is present, posterior surface also 

 parted by a furrow, finely and transversely striated ; abdomen elon- 

 gate, slender, the first segment almost linear on basal two-thirds, 

 slightly nodose, its length equal to the following segments united ; 

 wings subhyaline, iridescent, nervures dark. Length 11 mm. 



$ . — Clypeus shorter, subtruncate ; first joint of flagellum slightly 

 louger than two following united, apical joint small, not much longer 

 than the preceding one; middle segment with the furrow deeper 

 than in $ , and the upper and posterior surfaces coarsely and trans- 

 versely striated ; space between eyes at top greater than length of 

 first joint of flagellum, beneath at clypeus it is slightly less. Length 

 12 mm. 



Rio de Janeiro (November) ; Santarem. One of each sex. Re- 

 lated to fabricator Sm. and gracile Tasch. The space between eyes 

 at top and at clypeus is less in the 9, than in the $, an unusual 

 circumstance. 



Trypoxylon medianum n. sp. 



$ . — Black ; sides of first and second segments, and the latter at 

 base, reddish ; clothed with pale pubescence, that on face, clypeus, 

 tubercles, and postero-lateral angles of middle segment, pale golden ; 

 a silvery stripe runs below from tegulse ; clypeus tridentate at apex, 

 the median tooth acute and longest ; front apparently granulated, 

 feebly impressed ; a longitudinal raised line behind base of antenna? ; 

 space between eyes at top but slightly greater than that between them 

 at the clypeus, somewhat greater than the length of first joint of 

 flagellum ; the latter subclavate, first joint about as long as two fol- 

 lowing united, the ultimate joint small, not much longer than the 

 preceding one ; dorsulum and scutellum with distinct, separated 

 punctures, those of mesopleurse finest; middle segment above finely 

 punctato-striate, the posterior surface with distinct transverse stria? 

 deeply furrowed down middle, sides punctured; hind trochanters 

 not dentate ; abdomen clavate, rather stout, first segment a little 



