154 THE CANADIAN ENTOMOLOGIST. 



MoNACHUS, Chevr. 



Two very robust species of blue colour belong here ; they may be 

 obtained by sweeping meadows. Dr. Leconte separates them thus : — 

 Form oval ; prothorax smooth, opaque, rows of elytral punctures 



feeble atei% Hald. 



Form ovate ; prothorax with punctures near the base, rows of elytral 



punctures strong saponatus, Fabr. 



Both are of about the same size (.10-12 in.) and have rather 

 elongate antennae, which are testaceous at base. 



DiACHUS, Lee. 



Contains the smallest Canadian Cryptocephalini. They are of 

 cylindrical-oval form^ and somewhat metallic colours, overlaid on blue or 

 green. The two recorded from within our limits are : — 



Elytral stride obliterated behind the middle ; sides of prothorax, 



antennpe and legs testaceous; .06-. 08 in aiiratus, Fabr. 



Outer elytral striae impressed, curving around at tip ; prothorax 

 smooth ; colour, dark blue-green, antennae and legs reddish- 

 brown ; .08- 1 1 in catarius, Suifr. 



Bassareus, Hald. 



The two species look much like Cryptocephalus, but may be 

 distinguished by the character given in the table. B. detritus measures 

 from .18-22 in., and is of a blackish colour, the elytra with four red 

 spots ; the prothorax is opaque, sparsely punctured. The other species, 

 B. mammifer, has a smooth, shining prothorax, and varies from .14-22 

 in, in length. The typical form has elytra spotted like those of detritus ; 

 i. e., a large anterior spot on each wing-cover and an apical one. It 

 runs, however, through the following varieties, which have received 

 separate names : sellatus, Suffr., in which the anterior elytral spot is 

 reduced in size and the sides of the prothorax are white ; pretiosus, 

 Melsh., with a larger anterior elytral spot, which is connected with some 

 small basal spots, the prothorax with sides and two spots at base white ; 

 and luteipennis, Melsh., with yellow elytra. 



Cryptocephalus, Geoffr. 



A number of species occur in Canada, some of v/hich will be found 



mixed, in the collections of beginners, with Babia 4-guttata and the 



species of Bassareus. They are, however, readily separated when once 



attention has been called to the characters in use for the purpose. Th^ 



