478 bulletin: museum of comparative zoology. 



organs indicates that they were much shorter than in Plectrotetra. 

 The left antenna of the fossil (supposing the insect to be in its natural 

 position instead of upon its back) is taken to show the true structure, 

 the other being very evidently distorted. The courses of the elytral 

 striae, as they show through, are indicated on the figure by dotted lines 

 except in a few places where the punctuation is set up strongly so as 

 to allow of the delineation of the separate points with a camera lucida. 

 The specific name is given for the late Dr. Hermann A. Hagen, for 

 many years in charge of the entomological department of the Mu- 

 seum of Comparative Zo5logy. 



Prochaetocnema, gen. nov. 



Form similar to that of the recent genus Chaetocnema, particularly 

 the shorter species like C. coufinis. Head large, antennae slightly thick- 

 ened, 11 -jointed, decidedly less than half as long as the body. Front 

 coxae well separated by the strongly punctate prosternum, which is 

 expanded at tip. Middle and hind coxae well separated, intercoxal 

 process of first ventral blunt at tip. Ventral segments, as preserved, 

 very unequal, the first extremely long, the three following short, the 

 last nearly as long as the first. Hind femur much thickened, posterior 

 tibia long, expanded apically and with, a notch before the tip. 



Type. — P. florissantella, sp. nov. 



Prochaetocnema florissantella, sp. nov. 

 Plate 12, fig. 3. 



Form robust. Head moderately large; antennae shorter and 

 thicker than in the recent species of Halticini with which I have been 

 able to compare it, joints beyond the first subequal. Prosternum 

 moderately broad between the coxae and expanded at tip behind 

 them, strongly punctured. Meso- and metasternal regions more 

 finely punctate. Abdomen moderately strongly punctured at base, 

 less so apically, an arcuate row behind each posterior coxa. Hind leg 

 stout, the tibia strongly expanded apically, grooved on one face. 

 Elytra pimctatostriate, probably strongly, since the sculpture shows 

 fairly well near the margin where it is usually more or less obscured if 

 weak. Length, in somewhat bent attitude as preserved, 2.35 mm., 

 in life probably not far from 2.50 mm. 



