NORTH AMKRICAN COLEOPTERA. 83 



While the form of the claws in the comparatively small species 

 was observed, the fact entirely escaped both LeConte and Crotch 

 that some larger forms placed in Galerucella were similarly con- 

 structed. These will now take their places in Monoxia, with the 

 result of making the genus a little less homogeneous in aspect, but 

 leaving Galentcella more so by their absence. 



LeConte seems to have had an idea that the vertical pygidium 

 had some value, but in examining a large series it will be found that 

 while the pygidium may be more or less vertical in the males of the 

 small species, that member does not differ notably from that of other 

 Galerucini in their females, nor in either sex of the larger species. 



In accordance with the results obtained from a study of large 

 series of all the species the following table is presented : 



Larger species .27 — .34 inch. ; fifth joint of antennje very obviously shorter than 



either the fourth or the sixth puuctieollis. 



Smaller species .10 — .20 inch.; fifth joint of antennae not shorter. 

 Thorax narrower ^t apex than at base. 



Elytral punctuation rather fine and dense, a little coarser at base and near 

 the scutellum ; color usually entirely pale yellow, very rarely with spots. 



con sputa. 



Elytral punctuation comparatively coarse, scarcely finer at sides and apex 



than at base ; color dull yellow, with numerous small black spots, often 



arranged in series (lebilis. 



Thorax not narrowed at apex. 



Elytral punctuation fine, pubescence fine; color yellowish, with numerous 

 black spots with a tendency to coalesce along the suture sordicla. 



M. piiiicticollis Say, Journ. Acad, iii, 1824, p. 458; ed. Lee. ii, p. 222 

 morosa Lee, Pacif. R. E. Rep. p. 70; maritima Lee, Proc. Acad. 1865, p. 218 

 erosa Lee. Trans. Am. Ent. Soc. 1884, p. 28. — Form oblong, narrowed in froiit 

 surface finely pubescent, color variable from pale yellow to entirely black, or 

 with the elytra vittate. Autennse variable in color from entirely black to pale, 

 generally with the outer half dark, the base pale, fifth joint always shorter than 

 the fourth or sixth. Head coarsely and closely punctate. Thorax not quite 

 twice as wide at base as long at middle, broader at base than apex, sides feebly 

 arcuate, base broadly emarginate at middle, oblique each side, hind angles dis- 

 tinct; disc usually irregular, with broad, vague depressions each side, so that at 

 times the sides of the thorax appear deplanate, a vague median impressed line, 

 surface very coarsely and irregularly punctate ; elytra closely punctate and finely 

 pubescent, the punctures coarser near the base, fine and closer toward the sides 

 and apex. Body beneath finely sparsely punctate and pubescent. Length .27 — 

 .34 inch.; 7 — 8.5 mm. 



Male.— Clsiws finely bifid at tip; last ventral segment obtuse, with a short 

 median linear impression near the apex. 



Female. — Claws absolutely simple; last ventral obtuse, with a small notch at 

 middle, from which proceeds a slight impression or a smooth line. 



TRANS. AM. ENT. SOC. XX. MAY, 1893. 



