226 



HYMENOPTERA. 



L. Abbotii Leach. The flies appear early in June, and there is 

 but a single brood of larvae, which remain on the trees, in Illi- 

 nois, until November, and hibernate before changing to pupae. 

 The female is honey-yellow, with pale rufous legs, and the 

 male is jet black. Fig. 153 represents, after Riley, the trans- 

 formations of this species, whose habits closely resemble those 

 of L. abietis. 1, is the fly somewhat magnified; 6, magnified 

 antenna of the male ; 7, female antenna ; 2 and 3, pupae ; 

 4, larvae in different positions, natural size ; 5, cocoon. The L. 

 Lecontei Fitch has been found feeding on the Scotch and Aus- 

 trian pines in New Jersey, and has been . described by Mr. 

 Riley. The larva is an inch long, dirty or yellowish white, 

 with dorsal black marks wider before than behind, and usually 

 broken transversely in the full-grown individuals ; they are 

 farther apart than in L. Abbotii. "The lateral spots are some- 

 what square, with an additional row of smaller black marks 

 below them, and the last segment is entirely black above. The 

 antennae of the male fly are twenty- one-jointed, and have on 

 one side seventeen large, and on the other seventeen small 

 branches, there being eighteen on one side and fifteen on the 

 other in L. Abbotii. The female may at once be distinguished 

 from L. Abbotii by her abdomen being jet-black above, with a 

 small brown patch at the end, and a transverse line of the 

 same color just below the thorax." 



There are several allied genera, such as Cladius (C. isomera 

 Harris), Lyda (L. scripta Say), and Xyela (X. infuscata Har- 

 ris), which belong here. The last genus, Cephus, which by some 



" The females of Lophyrus are all much alike and I have found the number and 

 forms of the joints of the antennae, so far, the only reliable guide. The male looks 

 precisely like that of L. abietis, but the form of the antennae differs in being much 

 shorter. The female looks much like L. abdominalis Say, taken on the pine near 

 New York. The following list will show how the species may be distinguished by 

 counting the number of joints." 



male, not described, 



L. Fabricii Leach, 

 L. compar Leach, 

 L. pini-rigidaa Norton, 

 L. Abbotii Leach, 

 L. abietis Harris, 

 L abdominalis Say, 

 L. pinetum Norton, 

 L. Americanus Leach, 

 L. insularis Cresson, 

 L. Lecontei Fitch, 



15 joints 

 not described 

 21 joints, 

 not described, 

 19 joints, 

 not described, 

 17 joints, 

 17 " 



female, 16 joints. 

 16 

 17 

 17 

 18 

 38 

 18 

 19 

 20 

 21 



Pine. 



Pine. 



Pine. 



