A. A. GIRAULT. 291 



Anagrus arinatus iiigriv'eiitris, varietas nova. 



/^??«a/^.— Thesameas the typical form, differing in having the whole 

 abdomen very dark, nearly black, its tip somewhat lighter and in hav- 

 ing the thorax bright yellow ; the pronotum is also darker and the head ; 

 sometimes just the middle of the thorax remains yellow ; the base of 

 the fore wings, across the marginal vein is distinctly fumated ; the legs 

 and antennas remain, however, unaltered. 



Male. — Unknown. 



This variety, uniquely colored, appears like an entirely dif- 

 ferent species when viewed casually. Described from ten 

 females captured as follows : Four females captured at Cen- 

 tralia, Illinois, August 25, 1909, on the panes of a window ; 

 two others taken from the window of a greenhouse on the 

 campus of the University of Illinois at Urbana, April 30, 

 1910 ; and the four remaining specimens captured in the 

 same greenhouse May 2 (one female), October 19 (three 

 females), 1910. With the latter was a single female of the 

 typical form. 



7>/^.— Type No. 13,810, United States National Museum, 

 Washington, D. C, one female in xylol-balsam (wings miss- 

 ing ; the original Ashmedian specimen). 



Homotypes. — Accession No. 4-^,219, Illinois State Labora- 

 tory of Natural History, Urbana, one female in xylol-balsam 

 (Centralia, Illinois, August 29). 



Type of the variety nigriventris : Accession No. 4-4-,220, 

 Illinois State Laboratory of Natural History, Urbana, two 

 females in xylol-balsam, 2 slides (Centralia, Illinois, August 

 25). 



While not being able to compare the types of Anagrus 

 columbi Perkins, the description of that species leaves little 

 doubt but that it is identical with this species. Therefore, I 

 have given it above as a synonym. As shown elsewhere, 

 Eustoclnis xanthothorax Ashmead is also a synonym of this 

 species. Anagrus armat2is must be exceedingly common 

 throughout the United States. 



I have also the following specimens of the typical form : 

 Centralia, Illinois, on windows, two females (August 27 and 

 29, 1909); Urbana, in sweepings, one female (May 25, 1910). 

 And of the variety nigr-iventris, six females captured in a 



TRANS. AM. ENT. SOC, XXXVII. 



