HOW TO KNOW THE IMMATURE INSECTS 



4a. 10 pairs of prologs present on each abdominal segment; antennae 

 6- or 7-segmented. Fig. 584 Family XYELIDAE 



/^IfRTra?i?R'^/5T}7?r^ "^^^^^ ^^ species of the xyelid 



isil?fl°^?^!i?%/. s)?if::jDl!(H///£^ sawflies have been described. The 



^ 5 i ^ ' ^"-^^ larvae are free feeders on elms, 

 ry^ pines, hickory, butternut, etc. Pupa- 

 tion takes place in an earthen cell 



Fig. 584, Mogaxyelo mojor • .u^ «,«„«J 



Cresson. ^ the ground. 



4b. 6 to 8 pairs of prolegs, sometimes reduced or absent; antennae 

 never more than 5-segmented 5 



5a. Thoracic legs normal in form, 5-segmented; if modified, tarsal 

 daws always present; prologs usually developed 6 



5b. Thoracic legs fleshy, indistinctly 4- ^^ff^'''y'''|p%^ J//'/ i |i i | i||i in ^ 



segmented; tarsal claws wanting. ^^k£JM'di-^^ -^^^^ 



Fig. 585. . . . Subfamily Phyllotominae, ^v^^i^^^^^^^^-^^^^'s^^s^^^^'*^^^ 



TENTHREDINIDAE ^. ^^^ ^ ,. 



Fig. 585. Caliroo cerosi L. 



8a. Prologs present on abdominal segments 2-8 and 10; antennae 

 elongate, conical, usually 5-segmented 7 



6b. Prologs present on abdominal segments 2-7 and 10, rarely on seg- 

 ments 2-7 only or 2-6 and 10 11 



7a. Thoracic legs 5-segmented, normal in form 8 



7b. Thoracic legs 4-segmented, modified. 



Fig. 586 FamUy TENTREDINIDAE 



xriTmmjTi™ About 5,000 species of sawflies 



(r^;,JlJ^i^^ have been described. The habits of 



C^ ^^^.^-^ the larvae are various: leaf feeders, 



.Wi li'i JL(k|[)>ll332fN ^®^^ miners, gall makers and some 



b fi^^naisi'^^^*^*^^'^^^^^ ^P^^ webs. Pupation usually takes 



^ place in a parchment-like cocoon on 



Fig. 586. a, Emphytus sp. (Em- or in the ground. Many species are 

 phytinae); b, Phlebotrophie ^ -^ ,«i,. j^«»..„,^*:,,^ 



mofhesoni MQcGiiilvray. seriously destruotive. 



8a. 3rd abdominal segment with 6 annulets on dorsum. 



(See Fig. 587) 9 



8b. 3rd abdominal segment with more or less than 6 annulets on 

 dorsum 10 



212 



