NORTH AMKRIOAN COLEOPTERA. iS 



vergens. The latter having well defined and regular vittre, will not 

 be mistaken for this species. Small specimens of attenuata in which 

 the vitta is reduced to the minimum do resemble this one, but the 

 character of the punctuation and the female sexual characters readily 

 separate it. 



No specimens have been showing any trace of a discal yellow vitta, 

 although Dr. LeConte supposed they might exist. 



Occurs in Colorado, Utah, Lake Superior region, Nevada, northern 

 California and southern Oregon. Found on Solidago (Cockerell). 



CiAL.ERUCEL.L.A Crotch. 



Head not deeply inserted, usually with a distinctly impressed me- 

 dian line, frontal tubercles rather small ; labrum moderately promi- 

 nent, rounded in front; maxillary palpi stout, the terminal joint 

 conical, a little longer than the preceding. Antennae as long, or 

 longer than half the body, filiform ; third joint longer than the 

 fourth, joints 4-10 gradually decreasing in length, the eleventh lon- 

 ger. Thorax usually twice as wide as long, and a little narrower in 

 front, the disc with a median and lateral depressions with piceous 

 spots; scutellum oval at tip; elytra oblong or oval, the lateral mar- 

 gin somewhat explanate in all but two species, surface irregularly 

 punctate, usually coarsely, never really finely, the ornamentation 

 variable; epipleur?e moderately wide, extending three-fourths to 

 apex ; anterior coxal cavities open behind, confluent at middle, the 

 coxae moderately prominent • middle coxse contiguous, separated in 

 three species by a distinct prolongation of the niesosternum reaching 

 the metasternum. Legs not long, femora somewhat thickened, tibite 

 carinate externally and without terminal spurs; tarsi rather stout, 

 the first joint of the posterior not longer than the next two ; claws 

 bifid in both sexes, but more deeply in the females. 



This genus was proposed by Crotch for those species formerly en- 

 rolled in Galeruca, in which the anterior coxal cavities are open 

 behind. It includes in our fauna all those placed in Galeruca by 

 LeCoute (Synopsis, Proc. Acad. 1865), except externa, which is a 

 Galeruca, and maritima, morosa and erosa, which are removed to 

 Monoxia. 



Galerucella and Monoxia are very closely allied genera, and some 

 of the paler forms of iiotata, etc., are not easy to place, but the nmch 

 shorter antennj?e of Monoxia will distinguish the two. The male 

 claws of the two genera are much alike, but the secondary sexual 

 characters of the last ventral are better marked in Galerucella. 



TRANS. AM. ENT. SOC. XX. (10) MAY. 1893. 



