OF NATURAL HlSroUY. {]':] 



cous : terguui pale ycllowisli on the bas;il disk, blaclvish brown 

 at tip: venter mure or less yell()\visli-whitc, tlusky or lilatkish at 

 tip : feet and coxae whitish-green. 



Var. a. Feet and part of the costal rib green ; sciitil and poH- 

 tcrior portion of the stethidium whitish. [211] 



Var. (i. Thorax and abdomen entirely black. 



Length three-twentieths of an inch. 



This insect is common. 



IIYLOTO.MA I.atr. 



1. H. SCUTKLLATA. — Fulvous ; lioad and thorax, excepting 

 the humerus and scutel, blackish. 



Inhabits United States. 



9 Body reddish-yellow : head blue-bhuk : thorax blue-black ; 

 each side before the wings, including the superior portitm of the 

 pleura, reddish-yellow : scutel elevated, bright reddish-yellow : 

 metathorax with two obli(jue, oblong, white spots : wings dusky 

 violaceous : pectus, neck, incisures of the stethidium (and feet?) 

 blue-black : anal segments at tip black. 



Length nine-twentieths of an inch. 



I do not remember in what part of the Union I found this 

 species. The feet in the specimen are mutilated. 



2. H. CALCANKA. — Blackish ; thorax yellow ; tarsi whitish at 

 base. 



Inhabits United States. 



Violaceous black : thorax with the anterior superior portion of 

 the pleura yellow ; suture of the anterior segment, or collar, 

 blackish: wings dusky violaceous: t;irsi at base white. 



Length less than seven-twentieths of an inch. 



I have also lost the particular locality of this species. They 

 do not correspond with either of the species described by l)r. 

 Leach. [212] 



ATOMACERA Say. 



Generic character. — Body rather .short : antennnc with but three 

 obvious joints; in the male ciliated : cellules, one radial, unap- 

 pendiculated ; three or four cubitals, the dividing ncrvure of the 

 first and second being obsolete : tibias destitute of a spine in 

 their middle. 

 1835.] 43 



