on alidoniiiialsej^ments. Proxima] portion of legs j'ellow, distal 

 portion black. The sexual and other characters as far as observexi 

 differ but slightly from those of tripioirtdtd and binianddia. 



Length, 9-13 mm.; width, 1.2-2.0 mm. Average length, 12 

 mm. : width. 1.9 mm. The small specimens are obviously stunted. 



"Habitat, Decatur, lllin<)is. where it breeds in twigsof the 

 American elm, Ulnniti (iincricdiia. Descrilied from many speci- 

 mens reared by Mr. E. S. G. Titus and collected by himself and 

 Mr. Webster. 



"Type, No. 6981, U. S. National Museum. Kindly presented 

 by Dr. S. A. Forbes, Director of the Illinois State Laboratory of 

 Natural History. 



"This species has a somewhat strong resemblance, in dark 

 individuals, to 0. biiiidciddtd. while the pale forms approach 0. 

 tripuHctdtd. In reality it is nearer 0. tcrtnid in appearance, but 

 has longer antenna3 than anj of these. (J. te.rdiid is quite distinct 

 in having the paler parts, thorax, and ventral surface red, epi- 

 pleurae black, proximal portion of the legs reddish, head less 

 hairy, and abdomen comparatively strongly punctate." 



At present it does not appear possilile to separate the early 

 stages of this group of species. While there are obscure dif- 

 ferences, there do not appear to be the necessary positive ones. 



The Egg. (PI. L, Fig. 2.) 

 Length. 3 mm. -.width, 0.6 mm.;slightly reniform.of a creamy 

 white color, without perceivable reticulations. 



The Ld rid. (PI. L, Fig. 3.) 

 Length, 14 mm. Head much smaller than thoracic seg- 

 ments, body decreasing in width posteriorly with moderate uni- 

 formity to the eighth segment, which is considerably smaller, the 

 anal still more reduced; body light straw-color, the two posteri- 

 or segments lighter; head anteriorly dark brown, posteriorly the 

 color of the body, mandibles darker than anterior portion of 

 head. Cervical shield brownish yellow, anterior surface smooth 

 polished, terminating po.steriorly in a slightly raised, transverse 

 ridge. The apical declivity is shagreeued, more finely posteri- 



