THE INSECTS OF NEW JERSEY. 



595 



J. abbreviatus Say. (Cephus) Larva 

 bores into stems of willow and sure- 

 ly occurs in New Jersey. 



TRACHELUS Jur. 



T. tabidus Fab. (Calamenta johnsoni 

 Ashm.) Riverton V, 29 (Jn). 



i 

 ADIRUS Konow. 



A. trimaculatus Say. Trenton VII, 7 

 (Hk) ; Hammonton IX, Lahaway VI, 

 29 (Coll) ; the larva bores in the 

 stems of blackberry canes, entering 

 at the bottom and eating out the 

 center to the tip. 



CEPHUS Latr. 



C. pygmaeus Linn. (Astatus) The 

 "wheat stem-borer," an introduced 

 insect which has done considerable 

 injury in New York; but has not yet 

 been actually found in New Jersey. 

 It may be expected at almost any 

 time in the northern counties. 



Big. 240. Wheat stem-borer, Ccphns 

 pygmffus: a., larva in outline; b, 

 same, enlarged; c, larva in wheat 

 stalk; c, adult, enlarged; f, 

 a parasite infesting larva, 

 -\lso enlarged. 



Family ORYSSID^E. 



Species in which the antennae are situated just above the mandibles 

 under a sharp edge; the thorax and abdomen are so closely united as to 

 be almost immobile. 



ORYSSUS Latr. 



O. sayi Westw. Ashland, Long Branch (Jn). 

 O. terminalis Newn. Long Branch VI, 11 (Jn). 



Super-family CYNIPOIDEA. 



The insects of this series are "gall-wasps" or "gall flies," largely par- 

 asitic upon plants, though many of them are true insect parasites. Some 

 also are guests or inquiiines, inhabiting galls originally caused by other 

 species. Hence it is not unusual to breed from a large multicellular 

 gall several species of minute Hymenoptera; the true gall-maker in 

 small numbers, the guests and parasites sometimes in great quantity. 

 The galls are abnormal plant growths produced by the irritation of the 

 minute larvae upon the plant tissue, and each species produces its own 

 peculiar gall, so that classification is possible from these abnormal 



