TENTHREDINIDiE . 



213 



family, the second segment is shorter than half the length of 

 the abdomen, being much longer and less high and compressed 

 than in the Cynipides, and the ovipositor is retracted within 

 the abdomen. These insects are true internal parasites, re- 

 sembling the Chalcids. Ibalia is a parasite on a wood-beetle. 

 This genus has, by Walsh, been placed in the Cynipides. 

 Figites has feather-like antennji? in the male ; it is a parasite 

 on the larvai of Sarcophaga. The genus Allotria is a para- 

 site on Aphis. 



Walsh states that two genera, which he has identified as 

 Kleidotoma and Eucoila are true Figitida', and "have the 

 wings fringed like a Mymar, and the former has them emargi- 

 nate at tip with the radial area in vay species distinctl}^ open, 

 and the latter simple at tip with the radial ai^ea in my species 

 marginally closed by a coarse brown vein." Eucoila is sup- 

 posed to be parasitic on some insect attacking the turnip. 



TenthrediniDuE Leach. The Sav/-flies connect the Ilymen- 

 optera with the Lepidoptera. In the perfect state the}'^ con- 

 form to the Hymenop- ^ a 

 terous type, but as 

 larvae they would often 

 be mistaken for Lepi- 

 dopterous larvae, and 

 in their habits closely 

 resemble many cater- 

 pillars. The three 

 divisions of the body, 

 usually so trenchantly 

 marked in the higher 

 Ilymenoptera, are here ^'S- '^^■ 

 less distinct, since the abdomen is sessile, its basal ring being 

 bi'oad and applied closely to the thorax, while the succeeding 

 rings are very equal in size. The head is broad and the thorax- 

 wide, closely resembling that of the Lepidoptera. The Avings 

 (Fig. 144, fore-wing) are larger in proportion to the rest 

 of the body than usual ; they are more net-veined, the cells 

 being more numerous and extending to the outer margin.* 



*Iii treating of this family wo avail ourselves largely of the important work on 

 the American species, publishing at tlie time of writing, by Mr. E. Xorton, in the 

 Transactions of the American Entomological Society, vols. 1, 2. We therefore 



