584 NEW YORK STATE MUSEUM 



with fresh-water sponges on the under side of submerged logs. I found 

 them mainly on logs which had shed their bark, but this may have been 

 due to the greater ease of discovery on the smooth logs. 



HYMENOPTERA 



A few representatives of this order, parasitic on aquatic insects, were 

 found. Under the account of Chauliodes on page 547 there has 

 been mentioned the minute egg parasite, Trichogramma minu- 

 t u m which was found a very abundant parasite of the eggs of one 

 species of the above mentioned genus, destroying at least 70% of the eggs. 



A new species of Atractodes was found parasitic on the swale fly, 

 Sepedon fuscipennis, mentioned under the account of that species 

 on page 580. A description of the parasite, furnished by Mr Ashmead, 

 under the name Atractodes sepedontis Ashm. is given on 

 page 588. 



Four species of parasitic micro-hymenoptera were taken in the first 

 qualitative study detailed above in part 2, page 403, all new to science. 

 Mr Ashmead has at our request furnished descriptions (see pages 

 586-88). 



A few sawflies, collected at random during the summer, were sub- 

 mitted to A. D. MacGillivray, who reports on them as follows. 



LIST AND TWO NEW SPECIES OF SAWFLIES 



BY A. D. MACGILLIVRAY, CORNELL UNIVERSITY, ITHACA N. Y. 



Tricbiosoma angulatum Kirby 

 Tentbredo verticalis Say- 

 Tent b redo rufipes Say 

 Pacbyprotasls omega Norton 

 Pontania hyalina Norton 

 Dolerus bicolor Norton 

 Strongylogaster annulosus Norton 



Pachynematus corticosus sp. nov. 

 $ Black, with the following parts yellowish rufous, the clypeus, the 

 tegulae, the apical margin of the pronotum, the apices of the coxae, 

 the trochanters, the femora, the tibiae, except the posterior pair at apex, 

 the front and middle tarsi, the middle pair slightly infuscated at apex, 

 apical margin of abdominal tergites two to four, and the venter; the 

 clypeus roundly emarginate, the lobes broad and evenly rounded, the 

 head expanded back of the eyes, the vertex finely punctate, the lateral 

 walls of the ocellar basin sharp and moderately well defined, the frontal 

 crest well developed and not interrupted, the antennal fovea deep 

 and elongate ; the antennae elongate, tapering, the third segment slightly 

 longer than the fourth ; the sheath broad, its upper margin horizontal. 



