46 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 80 



arising from much beyond middle of stigma, inner side of latter 

 twice as long as the outer ; nervulus usually a little postf ureal, rarely 

 interstitial ; radiella strongly arched so that radiellan cell is very nar- 

 row at the middle; mediella twice as long as lower abscissa of basella, 

 the latter fully as long as nervellus ; upper abscissa of basella inter- 

 stitial with transverse abscissa of subcostella. Abdomen longer than 

 head and thorax combined; first and second, and most of third, 

 tergites closely longitudinally striate ; first tergite impressed at base ; 

 spiracles not beyond basal fourth of tergite; ovipositor sheaths a 

 little longer than the body. 



Color uniformly ferruginous; antennae sometimes more or less 

 brownish ; tarsi usually paler than femora or tibiae ; wings hyaline ; 

 stigma uniformly yellow or brownish yellow. 



In addition to the type series the national collection contains 

 several specimens reared from Cacoecia fervidana Clemens in North 

 Carolina and Virginia (C. Heinrich), two from Cacoecia cerasivo- 

 rana Fitch in Ohio (H. C. Ingerson), and collected specimens from 

 Maine, New Hampshire, New York, Pennsylvania, Connecticut, 

 Michigan, Kansas, Colorado, Arizona, New Mexico, and Washington. 

 Additional material examined consists of several specimens in the 

 collection of the Boston Society of Natural History from Marthas 

 Vineyard and Nantucket, Mass., and more than 200 specimens at the 

 gipsy moth laboratory, which were reared from C. cerasivorana and 

 G. fervidana taken at various localities in the New England States 

 and New Jersey. 



83. MACROCENTRUS DELICATUS Cresson 



Macrocentrus delicatus Cresson, Trans. Amer. Ent. Soc, vol. 4, p. 178, 1872. 



Type. — In the Academy of Natural Sciences of Philadelphia. 



Most closely allied to nwperus and texanus but easily distinguished 

 from both by lacking the conspicuous blackish transverse band on 

 vertex, and otherwise as noted in the key. 



One of the most common of the Nearctic species of Mac9'ocentru8, 

 and rather easily recognized. The following descriptive notes are 

 given to supplement the characters mentioned in the key: Ranges 

 in length from about 4 mm to about 8 mm. Head considerably 

 wider than thorax; eyes very large; temples and cheeks strongly 

 receding directly behind eyes; antennae usually 48 to 55 segmented, 

 but rarely, in unusually large specimens, up to 60-segmented ; the 

 male scape conspicuously thickened; face smooth, not or indistinctly 

 broader than long; longest segment of maxillary palpus usually a 

 little longer than second segment of antennal flagellum. Mesoscutum 

 smooth medially behind, the notauli usually not nearly extending 



