168 ACADEMY OF NATURAL SCIENCES 



3. L. sPHiERicoLLis. — [Ante, 1, 7.] - [ 300 ] 



4. L. NuTTALLi.— [Ante, 1, 5.] [301] 

 The antennae of this species in the proportional length of the 



second and third joints, are similar to those of the genus Zonitis, 

 as defined by Latr., Regne Animal, and together with those of 

 the species aenea, polita, sjjhsericollis and reticulata, are consider- 

 ably difi"erent from those of many of the other species of this 

 o-enus, being somewhat thicker towards the tip, but are much 

 shorter than in Zonitis; these characters, combined with form of 

 the terminal joint, approach them to the genus Mjjlahris; but 

 the antennae are not arquated at tip, and are of a more consider- 

 able length ; the habit also differs, the form of the body being 

 more elongated. These four species then, seem to have the 

 habit of Lytta, combined with a form of antennae approaching 

 somewhat to that of Mi/lahris. They cannot be referred to 

 Zonitis, as the palpi are not filiform, and the habit differs. 



First observed by Mr. Thomas Nuttall on the Missouri. I 

 found them on one occasion near the Rocky Mountains in great 

 numbers ; small bushes of various kinds were loaded with them. 



5. L, AENEA. — Greenish-blue or brassy, hairy : elytra glabrous, 

 brassy or purplish ; feet rufous, knees and trochanters black. 



LymexyJon aeneuni Melsheimer's Catalogue. 



Inhabits Pennsylvania. [302] 



Body bluish-green or dark brassy, opaque : head punctured, 

 hairy 3 eyes oval, not emarginate, fuscous : antennae black, longer 

 than the thorax, joints sub turbinate, terminal one largest near 

 the middle, acute at tip : labrum prominent, punctured, divided 

 by a profound sinus into two divaricated lobes : palpi blackish : 

 thorax punctured, narrowed before, not wider near the middle 

 than at base ; hairy : scutel hairy : elytra glabrous, somewhat 

 rugose, with two obsolete elevated lines : feet rufous, knees and 

 trochanters black. 



Length rather more than half an inch, 



Var, b. Tarsi black. 



This is not a common insect. It was referred by Mr. F. V. 

 Melsheimer to the genus Lymexylon, but it is not a Pentamerous 

 insect. 



(^Having failed to identify this species, it was described by me 



[Vol. III. 



