340 



tHE CANADIAN ENTOMOLOGIST. 



may do noticeable damage. The larva of Tritoma Immeralis, Fabr., is 

 nearly white, the head yellowish, the form moderately elongate, nearly 

 cylindrical, but tapering to each end, the ninth segment with two short, 

 erect, slightly recurved hooks or processes ; it lives in fungi, going under 

 ground to pupate, remaining in this state eight days. The pupa is .20 

 in. long, very bristly and with a stout spine on the tip of the abdomen. , 

 The genera are not in all 



cases readily separable by a 

 beginner, being sometimes (as 

 in Tritoma and Mycotretus) 

 much alike in general form 

 and appearance ; however, a 

 careful attention to the specific 

 descriptions ought to do away 

 with any doubt that may arise. ^ ^ 

 The following table will show -c 



the points of difference in the Fig. 58. 



Erotylid genera and enable those found with us to be recognized. 

 A. Form very elongate, parallel, front coxal cavities open . . . Languria. 



AA. Form more robust, front coxal cavities entire, 

 b. Tarsi distinctly five-jointed. 



Size small (. 1 2 in.). Dacne. 



Size large (.50-80 in.) Megalodacne. 



bb. Tarsi apparently four-jointed, the fourth joint very small. 



c. Last joint of palpi widely securiform, thorax with black 



spots Ischyrus. 



cc. Last joint of palpi oval or slightly triangular. Thorax 

 unspotted. 



Middle area of mentum large, tva.nsvexse... My cof re/us. 

 Middle area of mentum small, triangular Tritoma. 



Languria, Latr. 



The species of this genus are found under logs and stones early in 

 the spring, later they may be swept from plants. Two species, one of 

 which divides into two varieties, are known from our region. 



Thorax red, elytra bluish or greenish (.22-.31 in.) Mozanfi, Latr. 



