HOW TO KNOW THE IMMATURE INSECTS 



63b Mandible with a short or no prothecal process; median epicranial 

 suture usually not well developed, or entirely absent 64 



64a. Antenna with the sensory appendix longer than the distal seg- 

 ment. Fig. 248 Family CISIDAE 



This is a widely distribut- 

 ed family comprising prob- 

 ably over 300 species which 

 are found in old wood or 

 fungi. Some of the grubs 

 eat paper and are known as 

 "bookworms"; other species 

 ore pests where grain feed 

 is stored. 





J-^^A^r£A 



Fig. 248. Enneorthron sp. 



Fig. 249. Airora cylindrico Serv. 



64b. Antenna with the sensory appendix shorter than the distal seg- 

 ment or absent. Fig. 249 Family OSTOMIDAE 



The well-known cadelle, Tene- 

 broides mauiitanicus L., feeds pri- 

 marily upon grain and grain pro- 

 ducts, but sometimes also preys 

 on other insects which live in the 

 same medium. They are whitish 

 grubs and noticably flattened. 

 65a. Antenna without sensory appendix; ventral mouth pQrts apparent- 

 ly protracted. Fig. 250 Family CUCUJIDAE 



This family of flat bark 

 beetles contains less than 

 1,000 known species but they 

 are so variable that the fam- 

 ily appears at several places 

 in our key. 



Fig. 250. a, Ventral aspect of head, show- 

 ing the protracted mouth ports; b, Scolidio 

 linearis Lee. 



65b. Antenna with dilated sensory appendix; ventral mouth parts re- 

 tracted. Fig. 251 Group Bothriderini, COLYDIIDAE 



Some species of this group ore 

 phytophagous, some are preda- 

 te cious upon wood boring insects, 

 p^n ^^^'l '^^^s and a few are parasitic. Look for 

 ^^"'^ them on leaves or under the bark 



of trees. 



Fig. 251. a, Deretophrus oregonensis 



Horn; b, Antenna; c, Ventral aspect of 

 head, showing the retracted mouth 

 parts. 



100 



