—. 
470 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
the manner which frequently characterizes the sexes in recent species. 
The type of P. primus is presumed to be a male, and the specimen 
before me shows the following divergencies :— size larger, build a little 
heavier, antennae somewhat thicker, basal joints smoother, third 
relatively shorter. I find no characters upon which to base specific 
separation and therefore prefer to consider it the female of P. primus. 
The length is about 26.50 mm., but since the elytral apex is not quite 
perfect it cannot be ascertained exactly. 
CHRYSOMELIDAE. 
DONACIA PRIMAEVA Wickham. 
Two specimens, one with counterpart (No. 2,601-2,603 M. C. Z. 
No. 8,853 and 10,177, 11,989 S. H. Scudder Coll.), belong to a species 
of Donacia and are similar in all respects to my type of D. primaeva — 
except that the latter is a little smaller and has the punctuation better | 
defined. I donot think these differences give sufficient basis for speci- | 
fic separation and therefore include all the material under the above — 
name. | 
LEMA EVANESCENS Wickham. 
{ 
Represented by many specimens, the best of which are No. 2,604- 
2,611 M. C. Z. (No. 811, 897, 1,985, 3,593, 4,956, 8,693, 8,919, 9,595 
S. H. Scudder Coll.). 
LEMA FORTIOR, sp. nov. 
Plate 13, fig. 1. 
Form moderately stout but distorted by being much crushed. An- 
tennae stout, eyes prominent. Prothorax with no defined sculpture. 
separated by about their own diameters, the intervening spaces vary- | 
ing alittle more or less. Legs wanting. Length, from front of head to | 
elytral tip, 5.75 mm. ; 
Described from one specimen. } 
Type.— No. 2,612 M. C. Z. Florissant, Col. (No. 8,116 S. H. | 
Scudder Coll.). It is likely that No. 2,613 M. C. Z. (No. 7,762 5. H. | 
Scudder Coll.) also belongs here. I have provisionally considered — 
