98 GEO. H. HORN, M. D. 



This genus is very properly separated from all the others with 

 open front eoxal cavities and appendiculate claws by the entire ab- 

 sence of epipleurse in so far as these are defined by the acute lateral 

 margin of the elytra. It seems to me that this genus alone should 

 constitute the group of Phyllobroticites, and that FhyUecthrus should 

 be removed, reasons for which are given under that genus. 



There are now eight species known to me, five belonging to the 

 Atlantic region and three to the Pacific, the former having ornate 

 elytra, the latter blue or greenish. 



They may be known by the characters given in the following 

 table : 



LcKS pale or bicolored. 

 Thorax yellow. 

 Elytra bicolored, maculate, vittate or margined. 

 Head entirely yellow. 



Elytra yellow, with two oval piceous spots on each (lecorata. 



Elytra piceous, with suture and sides yellow. 



Elytra with elevated costse and punctate costipeuiiis. 



Elytra not costate. 



Thorax with a moderately deep fovea each side (liscoidea. 



Thorax with a transverse depression lilllbata. 



Head black, front pale; each elytron with an intermediate pale vitta. 



villata. 



Elytra uniform, blue or greenish .., viriilipeiiiiis. 



Thorax black, elytra dull blue or greenish luperiua. 



Legs entirely black. 



Head, thorax and body black, elytra dull blue nigripes. 



F. (lecorata Say, Journ. Acad, iii, p. 459; ed. Lee. ii, p. 203; Olivieri Kby., 

 Fauua Am. Bor. iv, p. 218. — Form elongate, parallel. Head black, front yellow, 

 impunctate. Anteunse piceous, the tliree basal joints yellow. Thorax broader 

 than long, sides slightlj' sinuate, disc smooth, color yellow. Elytra yellow, on 

 each two oval piceous spots, one at base smaller, and one behind the middle, 

 oblong; surface not distinctly punctate. Body beneath piceous black, with a 

 few sparsely placed punctures. Legs entirely yellow. Length .22 — .28 inch. ; 

 .5.5 — 7 mm. 



In the male the last ventral segment is large, canaliculate in front, 

 broadly concave near the apex, the apical margin bisinuate. The 

 last dorsal is deeply semicircularly emarginate ; po.sterior tibi« ar- 

 cuate ; the last ventral of the female is not concave, the apex oval. 

 Very little variation has been observed in this species. There is, 

 however, in Mr. Ulke's cabinet one female in which the two spots 

 unite and form a vitta, as in discoldea, but, from the fact that the 

 thorax is very evenly convex, I incline to consider it a variety of the 

 present species. Its size prevents it from being considered circtnndata. 

 Occurs in the Lake Superior region, Illinois and Colorado. 



