446 Materials for a Monograph 



Length of body, 1 in. ; of wing covers, 1.5 in.; of wings, 

 (when closed,) 1.8 in. ; of hind femora. 1.4 in, ; of oviposi- 

 tor, .8 in. I?. 



Texas, (Mus. Comp. Zobl.) 



MICROCENTRUM, Nov. gen. (//j/cpdf, 



Head oval, broader and stouter than in Phylloptera ; tu- 

 bercle of the vertex somewhat prominent, scarcely broader 

 than first joint of antennae, slightly furrowed ; eyes broadly 

 oval, very prominent ; first joint of antennae as broad as 

 long, second one-third as large but also stout, remainder 

 long and slender, cylindrical. Prothorax flat or very slightly 

 concave above, anterior border very slightly concave, pos- 

 terior quite convex ; the sides nearly parallel, the length 

 but little surpassing the breadth ; lateral carinae quite 

 sharp ; lobes of the side straight in front, well rounded and 

 curving forwards behind, rounded beneath, deeper than 

 broad ; wing-covers with the triangular superior surface 

 extending backwards farther than in Phylloptera, and the 

 wing-covers themselves not regularly rounded as there, 

 but with the inner border straighter till 

 near the tip, the outer border sloped off 

 toward the tip, and the tip itself more 

 Flg ' 4 ' pointed (see figs. 4 and 5) ; legs slender, 



much shorter than in Phyl- 

 loptera, especially the met- 

 athoracic; ovipositor very 

 short, strongly curved, and 

 bluntly pointed. 

 This genus differs from Phylloptera, to which it is most 

 nearly allied, especially by the cut of the wing-covers and 

 the shortness of the hind legs and ovipositor. 



1. M. RETINERVIS. 



Phylloptera retinervis, Burm., Handb. d. Ent. ; II. 692. 



(1838.) 



