356 Miscellaneous 



volume. The competition is open to all without any restriction, 

 and each memoir must be furnished with a motto for the purpose of 

 identification, the writer's name and address being placed in a sealed 

 envelope, having the motto on its outside. Competitors are re- 

 quested to write upon foolscap paper and upon one side only. 



The natural-history subjects suggested are as follows : — 



To be sent in not later than May 1, 1885 : 



1. Anatomy and Life-history of Echidna and Platypus-. 



2. Anatomy and Life-history of Mojlusca peculiar to Australia. 

 To bo sent in not later than May 1, 1886 : 



List of the Marine Fauna of Port Jackson, with descriptivo 

 Notes as to Habits, Distribution, &c. 

 To be sent in not later than May 1, 1887: 

 On the Infusoria peculiar to Australia. 



A new Insect injurious to Wheat. By C. V. RlLET. 



The following description was presented to the Washington Ento- 

 mological Society at its monthly meeting, Nov. 6. The description 

 is comparative with Isosoma tritici, lliley, with which it is most 

 nearly allied. 



Isosoma grandis, n. sp. 



Female. Length of body 4-2 millim., expanse 7'fi millim. An- 

 tenna; rather more slender and less clavate than in trilici and but 

 half the length of thorax. Thorax with the mesonotum slightly 

 more rugulose ; wings larger and less hyaline than in the winged 

 specimens of tritici, the veins extending to outer third, the sub- 

 marginal nearly four times as long as marginal ; legs with the 

 femora less swollen. Abdomen not so long as thorax, stouter than 

 in tritici, ovate-acuminate, approaching typical Eurytoma. Less 

 hairy than tritici, especially about legs, the hairs of abdomen being 

 less numerous, less regular, and shorter. Coloration similar to that 

 of tritici, but brighter and more highly contrasting, the pronotal 

 spot larger and brighter yellow, the pedicel of antenna? yellow, and 

 the femora with a definitely limited, suboval, yellowish spot below, 

 near the tip, extending two fifths the length of femur on front pair, 

 smaller on middle pair, and still shorter and less definite on posterior 

 pair. 



Larva. — Greenish yellow in colour. Average length 6 millim. ; 

 otherwise of same proportions and structure as in tritici. 



Pupa. — Average length 5 millim. Except in larger size and 

 ample wing-pads undistinguishable from that of tritici. 



Described from twenty-four females, reared from wheat-stems in 

 June, and taken by Mr. F. ~M. Webster at Lafayette, Indiana. The 

 species is treated of in my forthcoming report as U.-S. Entomolo- 

 gist, and works in wheat much as tritici, does. Its larger size, 

 stouter build, aside from the other characters mentioned, readily 

 distinguish it, however; while from hordei, Harris, vitis, Saunders, 

 and etymi, French, it is still more readily distinguished. — Bull. 

 Brooklyn Entom. Soc. vol. vii. p. 111. 



