FIELD BOOK OF INSECTS. 



the fifth segment; larvae of some of the Tenthredinidae 

 have as many as eleven pairs of legs, including those on 

 the thorax. 



m 



Our few species of XYELID/E may be known by their 

 antennas: the third of the more than three segments 

 usually being longer than all the following segments put 

 together. The larvag feed externally on various trees. 



The hind margin of the pronotum of the PAMPHILIID^E 

 is scarcely indented. A common species is Neurotoma 

 fasciata (Plate LXXXVII) whose larvae web the leaves 

 of wild cherry. 



In the following families the pronotum is frequently so 

 indented that the middle portion seems absent. 



The anterior tibiae of the TENTHREDINID.E have two 

 apical spurs, while those of the following families have 

 but one. This is a very large family, including most of 

 the saw-flies. The following notes on larval food-habits 

 are merely suggestive: Diprion on conifers; Dolerus are 

 grass-feeders; Endelomyia (Ethiops is a common rose-leaf 

 pest; Calichroa cerasi is the cherry and pear "slug"; 

 Cimbex americana (Plate LXXXVII) is the big, white 

 larva, common on willow, also found on elm, poplar, 

 and linden; Cladius pectinicornis on roses in spring, also 

 on clematis; Diphadnns appendiculatus is the Gooseberry 

 Saw-fly; Euura and Pontania make galls on willow; 

 Pteronidea ribesi (Plate LXXXVII) is the common Cur- 

 rant-worm, also on gooseberry; Monopliadnoides rubi 

 is the Raspberry Saw-fly; Erythraspides pygmtza on grape. 



The antennae of the ORYSSID^: are situated just above 

 the mandibles under a transverse ridge which conceals 

 their bases. The larva of Oryssus sayi bores in maple. 



The CEPHID/E are slender saw-flies of rather soft texture. 

 The larvae of Janus integer tunnel the pith of currants; of 

 Adirus trimaculatus bore in the stems of blackberry; and of 

 Cephus pygmczus in wheat. 



410 



