440 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 55. 



shrinks greatly in different directions upon the death of the insect, 

 and it was therefore thought unnecessary to iUustrate it. 



DESCRIPTIONS OF SPECIES. 



HARMOLITA GRANDIS form GRANDIS Riley. 



Plate 39, fig. 4 ; plate 45, fig. 20. 



Isosoma grandc Riley, Bull. Brooklyn Ent. Soc, vol. 7, p. Ill, 1884. 

 Isosonia {Philachyra) grande (Riley) Howard, U. S. Dept. Agr., Div. Ent„ 

 Bull, teeli. ser. No. 2, p. 9, 1896. 



This was originally described by Eiley as follows : 

 Female— Length of body, 4.2 mm. ; expanse, 7.6 mm. ; antennae rather more 

 slender and le.ss clavate than in the spring form and but half the length of the 

 thorax. Thorax with the mesonotum slightly more rugulose ; wings larger and 

 less hyaline than in tlie winged specimens of the spring form, with the veins 

 extending to the outer third, the submarginal nearly 4 times as long as the mar- 

 ginal ; legs with the femora less swollen. Abdomen not so long as the thorax, 

 stouter than in the spring form, ovate-acuminate, approaching typical Eurytoma. 

 Less hairy than in the spring form, especially about the legs, the hairs about 

 the abdomen being less numerous, less regular, and shorter. Coloration similar 

 to that of spring form, but brighter and more highly contrasting, the pronotal 

 spots larger and brighter yellow, the pedicel of the antennae yellow, and the 

 femora with a definitely limited suboval yellov.ish spot below, near the tip, 

 extending two-fifths the length of the femur on front pair, smaller on the 

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



Supplementary to Riley's description: 



Abdomen from base of second segment shorter than head and 

 thorax combined. First joint of club longer than broad. Pedicel plus 

 ring- joint shorter than first funicle joint. Mesothorax twice as long 

 as prothorax, and broader at scutum. Area laterad of propodial 

 groove black. 



Males. — Unknown. 



The supplementary descripton of H. grandis is based on numerous 

 specimens reared in cages under artificial conditions- and from speci- 

 mens reared from wheat straw collected in several States, from Cali- 

 fornia to the Atlantic and from Canada to Mexico. 



This species inhabits the center of the stem and has been reared only 

 from wheat ; it is usually found wherever Avheat is grown. 



Winged females of H. grandis form minuta, and occasionally wing- 

 less females of grandh will be found. Both forms are normally 

 thelyotokous, though males of form minuta are occasionally met with. 



HARMOLITA GRANDIS form MINUTA Riley. 



Plate 39, fig. 5 ; plate 45, fig. 15 ; plate 48, fig. 1. 

 Isosoma tritici Riley, Amer. Nat., March, p. 247, 1882 (not tritici Fitch). 

 Riley's original description was as follows : 



Female. — Length of body, 2.8 mm. ; expanse of wings, 4 mm. ; greatest width 

 of front wing, 0.7 mm. ; antennae, subclavate, | length of thorax ; whole body 



