294 THE CANADIAN ENTOMOLOGIST. 



the middle of the disk ; and here is a difficulty in referring it to the proper 

 genus by the classification, in which it is said the thorax in the Xantholinini 

 has " rows of punctures, of which the outer ones are curved." 

 Lathrobiu??i armatu)?i, Say. 



Like the foregoing, this species varies greatly in coloration, which 

 seems to be racial. Say described it from an example taken in Indiana, 

 which had the elytra entirely dark, as have my examples from Illinois. As 

 it occurs here, the apical half of the elytra is rufous, and no typically 

 coloured example has been taken, though the individuals are numerous, 

 inhabiting with mosquitos certain damp alluvial places overgrown by rank 

 vegetation. The colour of the legs in both forms is usually bright rufous, 

 thatof the antenn:e ferrugineous to brown, and the $ sexual characters are 

 identical. The species likewise occurs in Ohio, West Virginia, Wisconsin, 

 Michigan and Canada. 

 Bledius fcrrugincus, Lee. 



Is found along streams in wet, loamy places inhabited by Hetero:crus 

 and other mud insects. If it forms any galleries they cannot be 

 distinguished from those of the other occupants ; pouring water on such 

 places will frequently induce them to appear on the surface. The variety 

 which occurs here is the typical, as described by Dr. Leconte, which has a 

 shining black head and thorax, and the elytra bright ferrugineous, with the 

 suture and sculellar region piceous. Length, .18 to. 23 inch. 

 Bledius siabiiis, Casey. 



This species when found is abundant ; it lives in moist, grassy, com- 

 pacted places on the banks of streams, and frequently at some distance 

 from water. Its presence may be known by the surface galleries it 

 constructs for a habitation. The individuals vary in the colour of the 

 elytra about equally from piceolis-red (perhaps from immaturity) to 

 piceous-black, and average about .15 inch in length. July and August. 

 B. emaj-ginattis. Say. 



This beautiful little Bledius occurs everywhere in countless multitudes 

 on damp, loamy places along streams near running water in July and August. 

 These and an occasional example of aJinutaris are the only species of 

 the genus which have been observed here as yet ; with emarg'uiatus 

 occurs, but less abundantly, the minute Trogophlceus u?iiformis, Leconte, 

 about .05 inch in length, and dark coloured throughout. It constructs 

 surface galleries, and behaves like the preceding. Having no, or scarcely 

 visible, dorsal thoracic impressions, it strongly resembles, a small Bledius. 



