401 



Silaon blaisdelli n. gp. 



I'emale : Length 3.5 mm. ; wing 2.5 mm. 



Nervulus interstitial with tlic hasal nervurc. first recurrent nervure 

 received by the first cubital cell. 



Black ; mandibles more or less piceous at apex ; interrujjtcd line on 

 collar, tubercles, spot on tubercles, tegulae, spot on apex of front and 

 middle tibiae behind, stripe on tibiae outwardly, calcaria, and stripe 

 on metanotum yellowish-white ; margins of tergites and sternites pale 

 testaceous. Body with apprcssed silvery pubescence, more conspicu- 

 ous on sides of face, and on the margins of the tergites laterally 

 Clypeus shining not carinate, produced into a short rounded process 

 in the middle, front below with a tectiform ridge ; gibbosity of front 

 not impressed ; eyes but little divergent below ; ocelli in an olituse 

 triangle ; the posterior ocelli in front of the summit of the eyes, about 

 otie half as far from the eye margin as from each other. 



Face, front, vertex, occiput, collar, mesoscutum, scutellum and meta- 

 notum linely, closely and distinctly punctate, the metanotum more 

 finely so ; mesopleura with the surface sculpture similar in general but 

 somewhat concealed by the pubescence, above the impressed pit on the 

 mesepimeron is an ill-defined, glabrous shining spot with the surface 

 microscopically tessellate. Propodeum with the basal area well defined 

 by a U-shaped raised line, basally are some weak radiating striae not 

 one-fourth the length of the area, apically the rugosity of the surface 

 is transver.se; sides of propodeum finely longitudinally striolate ; fovea of 

 po,sterior face shallow, the parallel transverse ridges feeble but numer- 

 ous and reaching well toward the sides. 



Wings subhyaline, iridescent, tlie venation brownish. The petiole 

 of the second cubital cell short, not more than a fourth the length of 

 the sides of the cell, the cell triangular. 



vXbdomen shining, finely, di.scretely punctate. 



Described from a single female collected at San Diego, 

 (California. March 21), ISO! (Dr. F. E. Blaisdell). Type in 

 the anthor's collection. 



Siiiiihir to roJiireri. F'roni ro/iiceri it differs by the well- 

 (h'tined piopodeal area and longer propodenm. The basal area 

 is V-shaped in mh ii-cri. Pnrnis (of which the female is nn- 

 described ) is desciibed as liaving rlu^ radial cell not appendi- 

 cnhite wliile it is dislinctly so in hIaisdclJl. The basal area 

 of the propodenm of /Hirnis is described as ti'iangtdar wliilc it 

 is distinctly ronnded ix'hind in bloisdelli. Otherwise fi-om the 

 description the species are verj' near each other. 



