NORTH AMERICAN COLEOPTERA. 85 



habda canadensis, which later authors, even, have assuiued to be a 

 variety of baccharidis = tomentosa. Those who have studied Say's 

 methods of description will understand why he places the description 

 of pancticollis between Galeruca externa and Trirhabda attenuata. 



In regard to the forms described as erosa, morosa and maritima, no 

 tangible difference seems to exist. The first was separated on account 

 of its roughly punctured thorax, but a moderate series of specimens 

 from various localities shows no difference. The other two were dis- 

 tinguished by the short hair of maritima, and somewhat longer hair 

 in morosa. Here, too, the difference is imaginary, and depends 

 ratlier on the method of collection than the specimens themselves. 



M. coiispiita Lee, Paeif. E. R. Rep. Ins. p. 70; giittulnta Lee, loc. cit. ; 

 angularis Proc. Acad. 1859, p. 90. — Form oblong, slightly oval, pale yellowish 

 testaceous above and beneath, surface sparsely clothed with fi!ie silken pubes- 

 cence. Autenuse similar in color to the body, rarely slightly brownish, the fifth 

 joint not shorter than the sixth. Head closely punctate. Thorax not quite 

 twice as wide as long, narrower in front, widest between the basal angles, which 

 are usually obtuse, sides feebly arcuate, base truncate at middle, oblique each 

 side, disc uneven, a broad, but vague median depression, on each side a broad 

 shallow fovea, sometimes obliquely placed ; surface coarsely and moderately 

 closely punctate, finely pubescent; elytra often entirely unicolorous, frequently 

 with small black spots arranged in three indistinct series, surface closely punc- 

 tate, a little more coarsely near the base, but becoming rapidly finer and denser 

 toward the sides and apex. Body beneath closely punctate, the pubescence more 

 conspicuous than above. Length .14 — .18 inch. ; 3.5 — 4.5 mm. 



J(/a?e.— Claws finely bifid at tip ; last ventral broadly emargiuate, with a slight 

 notch at middle prolonged into a short impression, simulating a fissure ; pygidium 

 convex and slightly inflexed at apex. 



Female. — Claws simple ; last ventral slightly broadly emarginate, with a well 

 defined median impression the entire length of the segment, in the form of a 

 deep, sharply defined gutter. 



From the very large series before me this species seems the most 

 constant in form and color of any known. It is always pale ; the 

 black spots, when present, small, and arranged in three fairly regular 

 series. The next species often presents pale specimens resembling 

 those of the present, that the mode of punctuation alone must be 

 examined for their separation. The sexual characters are slightly 

 different, but only a large series and experience can make use of 

 this means. 



Occurs in Montana, Dakota, Kansas, Colorado, Utah, Washington, 

 Arizona and California. 



M. (lebilis Lee, Proc. Acad. 1865, p. 222; ohtusa Lee, loc. cit. — Very similar 

 in form to consputa, but with a generally darker color, differing superficially in 



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



