Sept., I9I5-] Girault: Chalcidoid Hymenoptera. 167 



being over twice the length of funicle two which is shortest, somewhat longer 

 than wide, longer than the pedicel ; funicle six longest, twice longer than 

 wide and along one side bearing a row of remarkable sensory organs 

 like minute clavate, conidial spores (absent in the other species). Both species 

 bear a long thoracic phragma. In Astyiiiachns japonicus, the marginal vein is 

 twice longer than wide, subequal to the stigmal ; here that vein is sub-puncti- 

 form, no longer than the evident postmarginal, the stigmal much longer. 



The females are golden yellow, the males dusky yellow (including the 

 appendages but the legs a little paler, the wings hyaline) ; funicles four to six 

 in the female white. 



From two pairs on a slide in the U. S. N. M. labelled " Par. of 

 Dactylopius mealybug-like form, possibly Psendococcus sp. (Received 

 labelled 'unknown eggs.' Reared May 19, 1906. Denmark, J. P. 

 Kryger.) The wings of the females were shrivelled. The locality is 

 Vangede Mose. 



The genus Astymacluis Howard differs from Xantlwcncyrtus 

 Ashmead only in having the mandibles acutely tridentate, the marginal 

 vein twice longer than wide, the postmarginal vein absent and the ovi- 

 positor distinctly longer (yet inserted distad of the middle) and 

 distinctly extruded. Also the face is more inflexed, the scape slen- 

 derer. Mirastymachus differs from Xanthoencyrtus in having the 

 club three-jointed. Types of Astyniachns japonicus Howard exam- 

 ined and type of Xanthoencyrtus nigroclavatus Ashmead. 



Types. — Catalogue No. 19398, U. S. N. M., two pairs on a slide. 



2. Mirastymachus americanus new species. 



Female. — Length, 1.15 mm. Dusky, the wings hyaline, the legs dusky 

 yellow; club and funicles one to three, black, funicle six, bulb and middle of 

 scape and base of pedicel darker than funicles four and five. The oblique 

 hairless line of the fore wing is broader than in the genotype and the funicle 

 joints are larger, one somewhat longer than wide. Otherwise about the same. 



Described from one female taken April 26, 19 15, by sweeping in 

 the forest. District of Columbia. 



Type. — Catalogue No. 19399, U. S. N. M., the female on a slide. 



EPICERCHYSIUS new genus. 



Female. — In my table of the earth's encyrtine genera runs to 

 Chcstomorpha Ashmead, the abdomen being compressed but it is as 

 long as the thorax, the ovipositor exerted for a third (or nearly) of 

 its length. The head is a little longer than wide (cephalic aspect). 



