»» THE GENUS CORYTHUCHA 



length. Hood not flattened on top or posteriorly. Reticulations of hood large 

 but not extremely so. Hood constricted, making the anterior portion of the 

 hood appear long and narrow, not distinctly triangular. Median carina with 

 areoles, sometimes two rows. Lateral carinae normally high, terminating a 

 considerable distance from base of hood, with areoles. Costal margins of 

 elytra shghtly concave. Spines on margins of membranous portions and at 

 apex of hood short. Nervures only spined at apex of hood. Length 3.5 mm., 

 width 1.7 mm. 



Antennae, legs, and nervures light yellow. Hood more or less embrowned. 

 Paranota with a large brown spot. Elytra with a browTi band at base and one 

 near apex. Inner margin of elytra brown. Apex of elytra hyaline. 



It is interesting to note that Prof. J. H. Comstock in the 1879 

 Report of the United States Department of Agriculture described 

 the egg and immature form, which at that time Prof. P. R. Uhler 

 considered merely a phytophagic form of arcuata Say. Later, 

 in 1903, Dr. A. W. Morrill described the eggs under the name 

 C. arcuata variety crataegi. Then, in 1916, Osborn and Drake 

 raised IMorrill's variety to specific rank. Crataegi must now go 

 into synonymy, as it has recently come to light that Dr. Asa Fitch 

 described and figured this species under the name T. cydoniae in 

 the Country Gentleman, February 14, 1861. Osborn and Drake 

 erroneously quote the International Code in saying that cydoniae 

 is invalid because it was desci'ibed and published in a non-scien- 

 tific journal. 



This species ranges over the entire United States and is also 

 reported from southern Canada. Hawthorn and quince are its 

 native food plants; however, it has been occasionally reported 

 from other trees but in no great numbers. 



22. Corythucha padi Drake 



1917. Corythucha padi Drake, Ohio Journal Sci., xxvii, no. 6, p. 215. 



Hood twice as high as median carina, Tvdth height about two-thirds its length, 

 noticeably longer than median carina. Height of hood not greater than length 

 of median carina. Reticulations of hood large. Spines on membranous mar- 

 gins and nervures rather small, not numerous. Costal margins of elytra nearly 

 straight. Size, 4 mm. long, 2.4 mm. wide. 



Brown spot on paranota. Top of hood more or less embrowned. Brown 

 band across base and apex of elytra. Apical band with a few areoles par- 

 tially hyaline. Apical areoles sometimes appear entirely hyaline. 



Species is recorded from Montana, Oregon, Washington, and 

 British Columbia. The host plant is Western Choke Cherry 

 {Primus demissa). The type and eighteen paratypes have been 

 examined. 



