Biology of the Membra cidae of the Cayuga Lake Basin 219 



1910 Ceresa diceros Matausch, Jouru. N. Y. Ent. Soc. 18:164. 

 1913 Fuiikh., Horn. Wing Veins, figs. 13, 14, 29. 



1913 Branch, Kans. Univ. Sci. Bui. 8:80, 100. 



1914 Bromley, Psyche 21 : 195. 



1915 .Metcalf, Horn. No. Car., p. G. 



1916 ^'an Duzee, Check List Hem., p. 5S, no. 1570. 



Is common on black elder (Sambucus canadensif< L.) in the lower parts 

 of the valley' and has been taken on a vaiiety of other hosts. An active 

 insect, easily disturbed, but usually returning; to its host after a short 

 flight. Easily identified by the bi'own transvei'se bands. 



The life history of this species has been followed from egg to adult on 

 the black elder. The eggs are laid in the bark about the middle of August, 

 in the second-year stems in deep slits. These eggs winter over and hatch 

 about the middle of May. The earliest record for an adult is July 29, 

 1914, the period of development being unusually long due to the fact 

 that the last nymphal instar is of extreme length. The adults are abundant 

 during August and disappear about the last of September. In seasons in 

 which warm weather occurred very late in the fall, the eggs have been 

 known to hatch but the nymphs from these eggs did not survive the 

 winter; and one brood a year is believed to be normal. The life history 

 of this species may be best observed in Stations B and P. 



Technical description. — Dark brown with transverse bands of yellowish white; supra- 

 humeral horns stout and blunt; posterior process decurved; tegmiua smoky hj'aline. 



Head broader than long, sculptured, basal part strongly and smoothly curved, front surface 

 light yellow faintly marked with brown, faintly longitudinally ridged, very lightly or not at 

 all punctate or pubescent; eyes prominent, extending beyond adjoining lateral margin of 

 pronotum; ocelli shining, transparent, nearer to each other than to the eyes; sclerites of 

 front projecting over clypeus at internal angles with a small hook; clypeus strong, swollen, 

 roughly three-lobed, the central lobe the largest, tips strongly hirsute. 



Pronotum densely and coarsely punctate; anterior surface slightly convex, light yellow 

 with numerous brown markings, sparingly pubescent with rather long hairs; suprahumeral 

 horns projecting outward and very slightly backward; lateral surfaces not pubescent, brown 

 with two transver.se light bands, the anterior broad and irregular in about center, the posterior 

 narrower and regular just before apex of posterior process; posterior process gradually acute, 

 extending beyond internal angles of tegmina. 



Tegmina hyaline, tips smoky, bases opaque and lightly punctate; five apical and three 

 discoidal cells. Undersurface of body very dark brown. Femora dark brown above; tibiae 

 and tarsi ferruginous. 



Length 9 mm.; width between humeral horns o.o mm. 



5. Ceresa bubalus Fabr. (Plate xxiv, 3-11) 



1794 Membracis bubalus Fabr., Ent. Syst. 4:14, no. 23. 



1803 Centrotus bubalus Fabr., S3'st. Rhyng., p. 20, no. 18. 



1840 Membracis bubalus Blanch., Hist. Nat. Ins. 3:181. 



1846 Centrotus bubalus Fairm., Rev. Memb., p. 286, no. 11. 



1851 Ceresa bubalus Fitch, Cat. Ins. N. Y., p. 50. 



