132 PSYCHE [August 



The writer has found adults of C. ciliata hibernating in large numbers in crevices 

 in an old wooden fence which ran below the branches of a buttonwood tree. 



A few very small pinkish immature heteropterous insects were once found to 

 be very active in destroying the young nymphs of the Oak Tingis but none were 

 bred to maturity. The adult form of a well-known predaceous heteropteron — 

 Triphleps insidiosus Say — has been found feeding on the young of C. ciliata and 

 from the similarity in the general appearance and habits of this adult and the 

 immature forms just mentioned it seems probable that they were of the same 

 species. 



A group of oaks on the college grounds gave an excellent opportunity for 

 observations on the food plants of the. Oak Tingis. The following oaks were found 

 to be badly infested : white oak {Qncnns alba), chestnut oak {Q. prinus)^ English 

 oak ((2. rubra), and dwarf chestnut oak (Q. acitminafa). The following were 

 apparently entirely immune to the attack of the insect although they stood so near 

 to badly infested trees that their branches touched in some cases : scarlet oak 

 (^Q. coccinea)^ scrub oak I^Q. il/icifolia) , ^.nd laurel oak {Q. lanrifoiia). A specimen 

 of mossy cup oak ((2- macrocarpa) growing a few hundred yards away was slightly 

 infested. 



The Hawthorn Tingis, Corythuca arcuata crataegi, siibsp, nov. 



During the summer of 1902 there was received at the Hatch Experiment 

 Station of the college a branch of hawthorn from Concord, Mass., which was sub- 

 mitted to the writer for examination. The leaves were discolored and practically 

 dead, which condition appeared to be due to a combination of both insect and 

 fungus pests. Among the remains of various insects, a few moulted skins of 

 tingitids were found which corresponded very well with the respective instances of 

 the Oak Tingis. A few eggs were also found upon the hawthorn leaves which 

 agreed with the figure and description given by Comstock in his report for 1879 

 (Rept. Comm. Agric, 1879, 1880, p. 221). The eggs are there described as 

 follows: ''The eggs of these insects .... are smooth, whitish, glistening, semi- 

 transparent, and ovoid in shape. Their average length is .3 mm. (.01 inch). 

 They are deposited on their broad end, and seem to be somewhat inserted into the 

 substance of the leaf ; they are covered completely by a brown, sticky substance 

 which hardens soon after oviposition. It adheres so firmly to the ^g^, especially 

 to the upper portion, that it is impossible to remove it without crushing the egg- 

 At its upper end this covering of the egg is squarely truncate, giving the whole 

 mass the appearance of the frustum of a cone with a porous lid They 



