174 AMERICAN HYMENOPTERA. 



Occiput with a triangular patch of yellow pile. Dorsum of thorax , ex- 

 cept naked center of disc, clothed with yellow pile. Mesopleura yellow 

 to bases of legs. Dorsum of abdomen with first segment yellow ; the 

 secotid yellow except for a dark area on each side ; the third dark in the 

 fniddle, especially toward the base, but yellow on the sides ; the fourth 

 black, with some yellow hair 07i the extreme sides ; segments five, six 

 and seven entirely dark. 



Female. — Unknown. 



Male. Head. — Face entirely dark, except a noticeable amount of 

 yellow pile above bases of antennae. Occiput largely covered with a 

 triangular patch of pure yellow pile. Ventro-lateral portion of head 

 entirely dark. Malar space distinctly shorter than its width at apex, 

 about one-sixth as long as eye. Clypeus mostly covered up with black 

 pile. Third antennal segment longer than fourth ; fifth somewhat 

 shorter than third and fourth together. 



Thorax. — Dorsum with a noticeable naked area on center of disc 

 and with a few black hairs immediately surrounding this area, but 

 otherwise covered entirely with yellow pile. Mesopleura yellow to 

 bases of legs. Metapleura mostly dark. Sides of median segment 

 mostly dark, but with a slight admixture of yellow hairs on their upper 

 portions. 



Abdomen. — Dorsum : segment one entirely covered with yellow pile; 

 segment two also yellow, but with a considerable area on each ante- 

 rior corner bearing black pile ; segment three with yellow pile on each 

 side, but black in the middle, the dark area being widest on the front 

 margin of the segment (where it is more than one-third as wide as the 

 whole segment) and narrowest on the hind margin (where it is about 

 one-fifth as wide as the segment); segment four black except for yel- 

 low pile on extreme sides ; segments five, six and seven entirely black. 

 Venter mostly black, but with apical margin of apical segment fringed 

 with short ferruginous hairs. 



Wings. — Rather light, only moderately infuscate. 



Legs. — Mostly black. 



Ditnensions.— Length, about 13| mm. ; spread of wings, about 32 

 mm. 



Psithyrus giiatenialensis Ckll. 



Psithyrus guatemalensis Cockerell, Ann. and Magaz. Nat. Hist., Ser. 

 8, X, 1912, p. 21, cf. 



I have not seen a specimen of this species, but I judge it 

 may be closely related to sololensis. 



Cockerell's description is as follows : 



" Length about 17 mm. ; anterior wing \\\. 



Black, with the elongate obconical abdomen ; malar space broader 

 than long; antennae black, the flagellum rather thick, its joints not 



