AHT. 23 REVISIOlSr OF MACEOCENTRUS MUESEBECK 31 



20. MACROCENTRUS NIGRIPECTUS, new species 



Most similar to ancylivorus, but distinguishable by the black 

 markings on mesonotal lobes and mesosternum, by the second tergite 

 being completely aciculate, by the lower part of mesopleura being 

 closely punctate and subopaque, and by the more distinctly foveolate 

 notauli. 



Fe7nale. — Length 4.2 mm. Face at least one and one-half times 

 as wide as long, convex, smooth, with only a few fine scattered punc- 

 tures, and with a finely impressed median line above ; clypeus strongly 

 convex, not twice as wide as long, subtruncate at apex ; eyes promi- 

 nent, but not large ; malar space longer than basal width of mandible ; 

 maxillary palpi a little longer than width of head, longest segment 

 hardly as long as second segment of antennal flagellum ; labial palpi 

 short, apical segment but little longer than the preceding segment; 

 vertex a little convex; ocell-ocular line twice the diameter of a 

 lateral ocellus; antennae 45-segmented. 



Thorax with notauli very finely foveolate; prescutum prominent, 

 descending abruptly in front; scutellum small, hardly half as long 

 as propodeum; propodeum completely finely rugulose, transversely 

 so behind; impression on lateral face of pronotum more or less 

 foveolate ; mesopleura impressed and closely punctate on lower half ; 

 metapleura finely granularly roughened and subopaque posteriorly; 

 anterior trochanters not longer than their coxae, apical teeth of all 

 trochanters well developed; posterior coxae faintly transversely 

 lineolated; radius arising from barely beyond middle of stigma; 

 first discoidal cell much longer than first cubital; nervulus postf ureal 

 by about half its length ; submedian cell closely hairy, without a hair- 

 less area apically; mediella much more than twice as long as lower 

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

 abscissa of basella but little more than half the lower. 



Abdomen only faintly longer than head and thorax combined; 

 first tergite twice as long as broad at apex, a little impressed at ex- 

 treme base, entirely closely finely longitudinally aciculate, the spira- 

 cles much farther from each other than from base of tergite; sec- 

 ond tergite also completely aciculate, except on the depressed lateral 

 margins which are broad toward base; third tergite very delicately 

 aciculate, at least medially on basal half; ovipositor sheaths distinctly 

 longer than the body. ;; •) 



Yellow-ferruginous; vertex rather brownish; antennae brownish, 

 blackish toward apex, scape yellowish brown; palpi brown or 

 piceous; mesonotal lobes mostly black; mesosternum blackish pos- 

 teriorly ; legs testaceous ; wings subhyaline ; stigma yellowish, weakly 

 clouded apically; veins brownish; first abdominal tergite somewhat 

 brownish ; apical tergites blackish. 



