48 PROCEEDINGS OF THE NATIONAL MUSEUM vol. SO 



34. MACROCENTRUS NUPERUS Cresson 



Maorocentrus nuperus Ckesson, Trans. Amer. Ent. Soc, vol. 4, p. 178, 1872. 



T^/pe. — 111 the Academy of Natural Sciences of Philadelphia. 



From delicatus, to which it is allied, nuperus differs especially in 

 the longer and narrower three basal abdominal tergites, with the 

 spiracles of the first even farther from the base and more prominent, 

 in the nervuliis being postfurcal by only half its length or less, in 

 the somewhat longer malar space, and in having a transverse black 

 band across vertex. From fexanus^ which it also closely resembles, 

 it is readily distinguished by the much longer and strongly sculptured 

 basal tergites of the abdomen and the shorter calcaria of the posterior 

 tibiae. 



In length the specimens examined range from 7 to 9 mm. Anten- 

 nae usually more than 50-segmented ; longest segment of maxillary 

 palpus about as long as second segment of antennal flagellum ; notauli 

 extending nearly to extreme apex of mesoscutum; scutellar furrow 

 very large; mesopleura usually punctate below; metapleural tooth 

 prominent, truncate; posterior coxae very long; longer calcarium of 

 hind tibia about half as long as metatarsus, not distinctly longer; 

 radius arising from beyond middle of stigma; first discoidal cell 

 somewhat longer than first cubital; submedian cell with onlj'^ a few 

 scattered hairs; mediella a little more than twice as long as lower 

 abscissa of basella, the latter fully as long as nervellus ; upper abscissa 

 of basella interstitial with transverse abscissa of subcostella ; abdomen 

 much longer than head and thorax combined ; first tergite more than 

 three times as long as broad at apex, not at all impressed at base 

 in front of spiracles, the surface of tergite irregularly longitudinally 

 rugulose or ruguloso-striate, the spiracles at about end of basal third 

 and much farther from base of tergite than from each other ; second 

 tergite twice as long as broad, longitudinally ruguloso-striate, par- 

 allel-sided, the lateral depressed margins rather broad, the raised 

 sculptured part constricted medially ; third tergite fully one and one- 

 half times as long as broad, delicately longitudinally aciculated on 

 basal half or more; ovipositor sheaths about as long as body. 



Yellow; vertex with a transverse blackish band extending almost 

 to the eyes; antennae yellow, the three or four basal flagellar seg- 

 ments blackish ; mesonotal lobes with more or less dusky to blackish 

 median markings, that on middle lobe usually broadest and darkest ; 

 wings hyaline, stigma yellow ; legs yellow. 



The foregoing notes are based on the type and on six collected 

 specimens in the United States National Museum; four of these 

 six are, like the type, from Texas ; two are from Plummers Island, Md. 



