SECRETARY'S REPORT. 171 



convex in front, concave at base ; face clothed with fine short 

 liairs ; eyes lateral, rather small ; eyelets (ocelli) thfce, i)lacod 

 in a triangle \ij)on the crown ; feelers, dull white, bearded, live- 

 jointed, the joints nearly cylindric, separated by intervening 

 pedicels, the last one elliptic and shortest. Antenna), .10 long, 

 filiform, bearded with short inclined bristles, composed of 

 twenty-five cylindrical joints ; basal joint thickest, top-shaped, 

 a third longer than tiiici^, receiving into its apex the second 

 joint, with which it is compactly joined, and which is thicker 

 than the following ones, a third longer than thick, and slightly 

 narfowing towards its apex ; third joint longest, and rather 

 more slender than the following joints, faintly thickened or 

 swollen near its base, and also at its apex, and showing when 

 greatly magnified a minute transverse joint interposed between 

 it and the second ; fourth joint a third shorter, more than four 

 times as long as thick ; remaining joints successively diminish- 

 ing in length, the last one more than twice as long as thick and 

 of an oval form. Thorax egg-shaped, and rather broader than 

 the head ; abdomen flattened, a little longer than the thorax 

 but scarcely as broad, long oval, more narrowed anteriorly and 

 bluntly rounded at tip, highly polished, its hind part clothed 

 with sliort hairs which are more dense at the tip. Legs black, 

 brownish at base and on the knees ; wings transparent, slightly 

 sijioky, strongly iridescent red and purple, fringed on their 

 hind edge, more conspicuously so on the hind pair ; stigma dull, 

 pale brown ; veins brownish black. 



" Aphidius {Praon') avenaphis, Fitch. Oat-louse Aphidius. 

 Black ; legs honey-yellow, and also the base of the abdomen 

 and a sub-basal band ; antenna? as long as the body, tliread- 

 like, twenty jointed. Length .10. Head black and shining, 

 square when viewed from above, and twice as broad as long ; 

 eyes oval, slightly projecting, occupying the fore part of each 

 side ; eyelets on the crown, appearing as tliree elevated shining 

 dots forming the corners of a triangle ; mouth and feelers very 

 pale yellow, the latter appearing as very slender threads jutting 

 from the mouth and as long as the head ; antenna) about as 

 long as the body, filiform, rather thick and robust, black, the 

 basal joint often pale in its under side, joints nineteen or 

 twenty, clothed with a short inclined Ijcard ; two first joints 

 shortest and compactly joined together, the basal one obpvate 



