AET. 23 REVISION OF MACEOCENTEUS MUESEBECK 19 



Mass. Three specimens in the national collection, from Washington, 

 D. C, are recorded as having been reared from Gacoecia pa/rallela 

 Robinson, while among the material at the gipsy moth laboratory 

 are 12 males reared from Gacoecia purpurana Clemens taken at 

 Brewer, Me., and 4 males obtained from Exarteiiia fasciatana Clem- 

 ens taken at Orrington, Me. 



This species is evidently exceedingly similar to nigridorsis Vie- 

 reck ; in fact, I suspect that the two may be identical and that it may 

 become necessary to suppress harrisi as a synonym, but since I have 

 not seen the type or authentic material of nigridorsis I am for the 

 present recognizing harrisi as valid. 



9. MACROCENTRUS PYRAUSTAE Viereck 



Macrocentrus pyraustae Viekeck, Connecticut Geol. and Nat. Hist. Surv. Bull. 

 22, p. 220, 1917 (1916). 



Type. — In the Connecticut Agricultural Experiment Station at 

 New Haven. 



The characters that will distinguish pyraustae from terminalis and 

 harrisi^ both of which it closely resembles, have been mentioned in 

 the discussion under those species or in the key. From gifuensis^ 

 which is also very similar, it differs principally in color as indicated 

 in the table to species; but the mandibles, though short, are hardly 

 as short as in gifiiensis^ distinctly crossing at the tips; the temples 

 and cheeks are a little more strongly receding and the radial cell 

 slightly shorter. 



Antennae long, usually 43 to 46 segmented; maxillary palpi long, 

 but the longest segment not distinctly so long as second segment of 

 antennal flagellum; prepectal carina strong, complete; metapleura 

 usually rugose on posterior half ; propodeum mostly rugulose ; apical 

 teeth of trochanters minute, indistinct ; radial cell ending considerably 

 before apex of wing; first discoidal cell very long; abdomen very 

 slender, the first tergite usually more than three times as long as 

 wide at apex, and the second tergite in the female nearly twice as 

 long as wide; ovipositor sheaths as long as the body. Head and 

 thorax black or blackish; antennae blackish with scape and pedicel 

 yellow ; usually apex of scutellum and the surrounding parts brown- 

 ish; abdomen black with third tergite bright testaceous, and often 

 the second more or less pale; legs yellow, with posterior tibiae 

 weakly infuscated. 



The above discussion and descriptive notes are based on the type, 

 two paratypes in the Philadelphia Academy of Natural Sciences, 

 two paratypes, and two additional specimens reared from " a tortri- 

 cid in turtle-head," at Ithaca, N. Y., in the national collection; and 

 31 specimens at the gipsy moth laboratory, which were reared from 



