RUTELIN/E 45 



beneath, on the apical half of the head and at the sides and narrowly 

 along the middle of the pronotum, the tarsi all black, the elytral 

 margin thickened near the base; the female is much larger, more 

 rhomboidal, with very thick elytral margins, becoming very thin 

 posteriorly; it is wholly testaceous, excepting the tarsi and two 

 well separated pronotal black spots. These observations seem to 

 confirm, in general, the opinion of Mr. Arrow (Tr. Ent. Soc. Lond., 

 1899, p. 260), that the coloration in mdua is of a sexual nature, as 

 stated by Burmeister but denied by Bates, but is not so confirma- 

 tory in regard to puncticeps, where the color may be either deep 

 black or almost entirely pale within what seems to be the same sex. 



Group III. 

 Subgenus Hemispilota nov. 



The body is here much less shining as a rule than in either of the 

 preceding and is more convex and more deeply sculptured than in 

 Pacliystethus. In its typical forms it is a boreal group and does 

 not seem to occur south of the Mexican boundary, except in the 

 aberrant Anomala nitidula and micans of Mexico and Central 

 America. The three American forms in my collection, one of 

 which may be regarded as subspecific, may be described as follows : 



Elytral punctures moderate, the striae only moderately impressed; 

 thoracic punctures generally less close-set; lustre never metallic 

 at any part. Body (9) stouter, convex, shining, pale brownish- 

 flavate in color throughout above and beneath, excepting occasion- 

 ally two oblique black thoracic spots, or (cf ) of a slightly less clear 

 tint, with the post-sterna blackish, the pronotum invariably black, 

 pale at the sides and irregularly along the median parts of the base, 

 the black area sometimes much retracted from the base and bi- 

 furcate, or with the entire body deep black; head irregularly punc- 

 tulate, densely anteriorly; clypeus large, very transverse, roundly 

 trapezoidal, the edges very moderately reflexed; eyes small, not 

 prominent; antennal club (cf) always dark, as long as the stem, or 

 (9) distinctly shorter; prothorax nearly twice as wide as long in 

 the female, much less in the male, trapezoidal, with almost evenly 

 arcuate sides, deeply sinuate at apex, the fine basal bead only trace- 

 able for a short distance sublaterally ; surface convex, somewhat 

 uneven, with rather small but deep and sparse impressed punctures, 

 slightly stronger laterad; scutellum unusually short, with small 

 sparse punctures; elytra barely as long as wide, slightly inflated, 

 obtusely rounded behind, the side margins somewhat thickened and 

 uneven basally, but little more evidently in the female; striae rather 



