ART. 23 REVISION OF MACROCENTRUS MUESEBECK 17 



pear to agree so completely with the original description, and with 

 notes made by S. A. Rohwer in 1915 on an examination of the type, 

 as to leave little doubt that they are longicomis. The species, as 

 represented by these specimens, is most similar to pyraustcke and 

 harrisi, but it can be readily separated by the characters mentioned 

 in the key. The following additional notes are likewise based on 

 the specimens in the National Museum: Malar space shorter than 

 basal width of mandible; cheeks and temples rounded, full; anten- 

 nae 37 to 44 segmented; ocell-ocular line twice the diameter of an 

 ocellus; mandibles quite long, the apices crossing; face short and 

 broad, nearly twice as broad as long; clypeus rather large, strongly 

 convex ; entire insect black except palpi, scape and pedicel of anten- 

 nae, mandibles, legs, and the three basal sternites of the abdomen. 



7. MACROCENTRUS PERONEAE, new species 



Most similar to harrisi, but at once distinguished by its unusually 

 short and relativelj^ broad radial cell, the blackish abdominal stern- 

 ites, the broader depressed lateral margins of second tergite, and by 

 the lower abscissa of basella being scarcely longer than nervellus and 

 scarcely half as long as mediella. 



Female. — ^Length 4.5 mm. Head rather small, only very slightly 

 wider than thorax; eyes broadly oval, not large; temples strongly 

 receding; cheeks rounded; face broad, smooth, impressed medially 

 above and with a short low ridgelike elevation just below this im- 

 pression ; clypeus small, convex, apically truncate ; malar space fully 

 as long as basal width of mandible; ocell-ocular line nearly twice 

 diameter of an ocellus ; maxillary palpi long, longest segment slightly 

 longer than second flagellar segment ; antennae longer than the body, 

 46-segmented. 



Thorax with propodeum delicately rugulose; pleura smooth, ex- 

 cept metapleura at apex; metapleural tooth not distinct; legs very 

 slender; longer calcarium of posterior tibia hardly one-third the 

 basitarsus; trochanters with the apical teeth minute, indistinct; 

 stigma large, broad, emitting radius from very slightly beyond 

 middle; radial cell unusually short, ending far before wing apex, 

 measured on wing margin scarcely longer than stigma and not more 

 than one and one-half times as long as broad ; submedian cell 

 closely hairy apically; nervulus postf ureal by less than half its 

 length ; radiellan cell long, not widening apically. 



Abdomen longer than head and thorax combined; first tergite 



hardly twice as long as broad at apex, finely longitudinally acicu- 



lated ; second slightly longer than broad at apex, also longitudinally 



aciculated, the depressed lateral margins broadest at base, the sculp- 



98306—32 3 



