SEEPHOID AND CHALCIDOID PAEASITES OF THE HESSIAN FLY 109 



and Virginia, and from Ontario, Canada. Additional records taken 

 from specimens in the National Museum collection and from the 

 note files of the Bureau of Entomology show that it occurs in Mary- 

 land, Pennsylvania, District of Columbia, North Carolina, South 

 Carolina, Kansas, Nebraska, Wisconsin, Minnesota, North Dakota, 

 Montana, and Oregon. It probably occurs wherever the various 

 species of Harmolita, its preferred hosts, are to be found. 



IMPORTANCE 



While this species is one of the more important parasites of the 

 jointworm flies, it is apparently of no importance as a parasite of the 

 hessian fly. The single instance thus far observed of its develop- 

 ment upon this host was very likely purely incidental. 



CALLITULA BICOLOR Spinola 



(Fig. 25) 



Callitula bioolor Spinola, Ann. Mus. Hist. Nat. Paris 17: 151, 1811; Gahan 

 and Pagan, U.S. Natl. Mus. Bui. 124: 26, 1923; Hill and Smith, Jour. Agr. 

 Research 36 : 153, 1928 : Imms, Parasitology 22 : 33, 1930 : 24 ; 442, 1932. 



MicromcVus rufomaculatus Walker, Ent. Mag. 1: 465, 1833; Blanchard, His- 

 toire naturelle des inseetes . . ., v. 3, p. 267, 1840 ; Westwood, An introduction 

 to the modern classification of insects . . ., v. 2, synopsis, p. 69, 1840; Rein- 

 hard, Berlin. Ent. Ztschr. 2 : 18, 1858 ; Schmiedeknecht, Hymenoptera, Fam. 

 Chalcididae, m Wytsman, Genera insectorum, f asc. 97, p. 363, 1909 ; Kurdjumov, 

 Messager Ent. [Kiev] 2 : 2, 1913 ; Znamenski, Poltava Agr. Expt. Sta., Ent. 

 Dept. Bui. 2, 1923 (abstract in Rev. Appl. Ent. (A) 12: 291, 1924. Meyer, Rpt. 

 Appl. Ent. Leningrad 4 : 241, 1929 ; Tzuigankov, Trans. Poltava Agr. Expt. Sta., 

 no. 90, Ent. Div. no. xvi, 1930 (abstract in Rev. Appl. Ent. (A) 19: 385, 1931). 



Pteromaliis plagiatus Nees von Esenbeck, Hymenopterorum ichneumonibus 

 affinium monographie . . ., v. 2, p. 115, 1834. 



Boeotomus plagiatus Thomson, Skandinaviens Hymenoptera, v. 5, p. 61, 1878. 



Baeotomus rufomaculatus Ashmead, Psyche 8: 134, 1897; Marchal, Ann. Soc. 

 Ent. France 66: 83, 1897; Osborn, U.S.Dept.Agr., Div. Ent. Bui. (n. s.) 16: 29, 

 1898; Dalla Torre, Catalogus hymenopterorum . . ., v. 5, p. 89', 1898: Masi, 

 Ann. Mus. Civ. Stor. Nat. Genova (3a) 10: 146, 1922. 



DESCRIPTION 



Callitula bioolor resembles the winged form of Eupteromalus ful- 

 vipes, but it may be distinguished by the 5- jointed funicle, the im- 

 margined occiput, and the prominent neck on the propodeum. These 

 characters, combined with the fact that the legs, including all coxae, 

 and usually a large spot at the base of the abdomen are reddish 

 testaceous, will separate it from the other hessian-fly parasites. 



Female. — Length 1.1 to 2.1 mm. Head transverse, broader than the thorax, 

 fully two and one half times as broad as long antero-posteriorly at the middle ; 

 occiput very slightly concave, entirely immargined ; ocelli in a low triangle, 

 the lateral ocelli three or more times their own diameters from the eye mar- 

 gins ; temples strongly receding, the head narrowing from the eye margins ; 

 antennal groove broad and shallow ; viewed from in front, the head broader 

 than high, the cheeks rounded ; malar space equal in length to nearly half the 

 eye height; malar furrow very delicate; eyes moderately large, ovate, and 

 practically bare; clypeus not separated from the face, its anterior margin 

 weakly sinuated ; clypeal region very finely convergently striated, the rest of 

 head reticulate-punctate, the punctures on back of head and on face and cheeks 

 a little finer than those on upper part of frons and vertex; right mandible 

 3-toothed, left mandible 4-toothed. Antennae inserted a little below the middle 

 of head, but distinctly above the lower extremity of eyes, 11-jointed, consisting 

 of a slender scape which is cylindrical and reaches to the front ocellus, a 



