HOW TO KNOW THE IMMATURE INSECTS 



112a. Back of mandible opposite the cutting edge with sharp margin; 

 opposite the mola, excavate and without a spinose setose eleva- 

 tion. Fig. 315 Family ALLECULIDAE 



These are the "comb- 

 clawed bark beetles". They 

 are closely related to the 

 tenebrionids. The larvae 

 look like wireworms and 

 live in rotten wood 



.mmxf^ 



Fig. 315. a, Copnochroo f uliginose Melsh; 

 b. Mandible. 



112b. Back of mandible not as described above. 



Fig. 316 FamUy TENEBRIONIDAE 



One of the largest family of 

 Coleoptera comprising more than 

 10,000 species. The larvae bear 

 a close resemblance to those of 

 the Elateridae, but the labrum is 

 distinct. The majority of the spe- 

 cies are scavengers, some feed upon grain or grain products and a 

 few are found in association with bark and wood borers. The well- 

 known mealworm, Tenehiio molitoi L., and the confused flour beetle, 

 Tiiholium coniusum Duval, are pests in mills and storehouses. 



Fig. il6. 

 DeGeer. 



Alobates pennsylvanico 



113a. Molar part of mandible with the grinding surface transversely 

 multicarinate; antenna short and 2-segmented. 

 Fig. 317 Family NILIONIDAE 



The members of this exotic family are found in 

 South America. 



Fig. 317. a, Leio- 

 chrodes sp.; b. 

 Mandible. 



113b. Molar part of mandible with the grinding surface either smooth, 



or bearing obtuse tubercles; antenna elongate and 2 or 3-seg- 



mented, distal segment minute or absent. 



Fig. 318 Family LAGRIIDAE 



This is still another 

 family of bark beetles. 

 The larva often feed on 

 leaves. They are elon- 

 gate and cylindrical. 



a b 



Fig. 318. a, Lagria sp.; b, Mandible. 



116 



