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 do not 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. 

 Elytra with rows of strong circular punctures, those in any one row 

 separated by about their own diameters, the intervening spaces vary- 

 ing a little 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 S. H. 

 Scudder Coll.) also belongs here. I have provisionally considered 



