1916] Miscellaneous Chalcidoid Hymenoptera 301 



The male is wholly blue, the wings hyaline, the legs except the last 

 tarsal joints and most of the caudal tibiae and the antennae except scape 

 and pedicel, pale yellow. Club soHd, the flagellum clothed with whorls 

 of long hairs. Pedicel very short. In the type female, the middle tibia 

 is dark just below the knee. 



One male, seven females reared from Pulvinaria spp. on 

 Poison Ivy, Madison, Wisconsin and from Physokermes picecE 

 on Picea abies. The mandibles in all specimens were as in 

 Cristatithorax. 



In the male, funicles 1 and 6 are longest, nearly thrice longer 

 than wide, shorter than the club; funicles 2 and 3 subequal, 

 shortest, the joints widest a little out from the base. Club five 

 times longer than wide, or more. 



Ooctonus quadricarinatus new species. 



Male: Length, 1.30 mm. 



Propodeum with a pair of median carinse which diverge widely to 

 middle, then converge to apex, forming a large diamond; its caudal and 

 cephalic margins carinated; and a strong lateral carina which from 

 cephalad runs meso-caudad for over half way, joining (or nearly) the 

 lateral angulation of the diamond of the median carinae, thence for a 

 short distance latero-caudad to apex; this shorter ami forms therefore 

 a rather small, distinct diamond -shaped areola. Lateral margin also 

 strongly carinated and between this and the minute spiracle runs a 

 long, oblique, smooth groove. Propodeum and postscutellum glabrous; 

 rest of thorax strongly scaly. Scutellum divided by a semi-circular 

 cross-suture whose apex is proximad of the middle, the convexity facing 

 cephalad. Lateral margin of postscutellum carinated. Head finely 

 scaly. Abdominal petiole long, somewhat longer than the caudal coxae. 

 Black, the wings hyaline, their venation black; tarsi, knees, tips of 

 tibise rather broadly and scape and pedicel, more or less reddish brown. 

 Characterized by the very broad fore wings which are subtruncate at 

 apex and bear about 38 lines of very fine discal cilia where widest, the 

 longest marginal cilia not a tenth of the greatest wing width. Caudal 

 wings with 4-5 lines of discal cilia. Pedicel a Httle longer than wide; 

 funicle joints six or more times longer than wide, the club shorter but 

 somewhat longer than funicle 1. Proximal tarsal joint much the longest. 

 Venation elongate. 



Described from three males reared in connection with bark 

 beetles (from limbs of pine infested with Pityogenes hopkinsi) 

 August 16, 1915, New York. The locality is Syracuse. 



Types: Catalogue No. 19942, U. S. N. M., the above speci- 

 mens on a slide. 



