178 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



nymphs migrate, shortly after hatching, to succulent weeds — sweet 

 clover and joe-pye weed being favorite hosts — on which they feed 

 while completing their development. The adult females then 

 migrate back to the trees for ovipositing. This species has been 

 accused of doing considerable damage to young trees by the 

 mechanical injury due to oviposition. Mr. Woodruff's field notes 

 record that it seems to prefer host plants of damp localities. 



Hosts : Elm, apple, pear, sycamore, aster, poplar, potato, butter- 

 nut, hazelnut, sumac, white oak, red oak, black oak, locust, willow, 

 elder, sweet clover, hickory, pignut, joe-pye weed, bulrush 

 (Scirpus pungens), boneset, swamp white oak. 



Hartford, 2 Oct., 1913 (W. E. B.) ; Branford, 29 July, 1904 (P. L. B.) ; 

 Aug., 1905 (H. W. W.) ; East Hartford, 9 Aug., 1904 (P. L. B.) ; Stafford, 

 23 Aug., 1905 (W. E. B.) ; Wallingford, 3 Aug., 1910, 8, 14 Aug., 1912 

 (D. J. C.) ; Manchester, 30 Aug., 1912 (D. J. C.) ; New Haven, 

 27 Aug., 1 Sept., 1914 (W. E. B.) ; 1 Aug., 1916 (M. P. Z.) ; New Canaan, 

 19 Sept., 1919 (B. H. W.) ; 16 Sept., 1913 (W. E. B.) ; 29 Sept., 1909 

 (I. W. D.) ; 29 Sept., 1910 (D. J. C.) ; Portland, 15 Aug., 1913; Mystic, 

 25 July, 1915 (B. H. W.) ; Litchfield, Sept. (L. B. W.). 



C. brevis Walker. 



1851. Ceresa brevis Walker. List Horn. Brit. Mus., ii, 528. 



Rare. Only two records from Connecticut and taken but few 

 times in neighboring States. 



A distinct little species of a bright green color above but slightly 

 marked with black at the bases of the legs and on sides of femora. 

 Distinguished by the shape and position of the suprahumeral horns 

 which are long, acute and slightly curved backward. 



The life history and hosts are unknown. 



New Haven, 20 Aug., 1909 (A. I. B.) ; Litchfield, Sept. (L. B. W.). 

 C. brevicornis Fitch. 



1856. Ceresa brezncornis Fitch. Third Rept. Ins. N. Y., 451. 177. 



Rare. A number of the references to this species in literature 

 probably refer to C. brevis or C. borealis. 



Ceresa brevicornis is near C. brevis but differs in having the 

 suprahumerals short and blunt. The species is small, of a uniform 

 green color ; the vertex is plainly marked with longitudinal striae 

 and the clypeus projects well below the lateral borders of the head. 



The life history and hosts are unknown. 



New Haven, 12 July, 1905 (B. H. W.) ; 7 Aug., 1905 ( W. E. B.) ; Scot- 

 land, 8 Aug., Canterbury, 14 Aug., 1905 (B. H. W.). 



C. constans (Walker). 



1851. Thelia constans Walker. List. Horn. Brit. Mus., ii, 563. 

 1869. Ceresa constans Stal. Bid. Memb. Kan., 245. 



Probably rare. The writer has taken it rather commonly in 

 New York State on locust but Mr. Woodruff has taken it in 

 Connecticut only on oak (species not recorded). 



