210 MAINE AGRICULTURAL EXPERIMENT STATION. I9IO. 



Figs. 143, 144, 145. Described from 3 balsam specimens of 

 material collected by F. A. Sirrine, 9-30-'92. Habitat, roots 

 of grass, Leersia virginica. 



f generation. "T. graminis n. sp. Head and thorax 



5usky, abdomen dusky or sometimes of a greenish or yellowish 

 ange. Antennae dusky, the third joint as long as the three 

 following taken together ; joints four and five equal ; apical 

 joint a little over half as long as the preceding. Wings hya- 

 .me. Subcostal of the hind wing comparatively straight. 



Length of body .08, to tip of wings .12 in. 



On leaves of Aira ccespitosa and Agrostis plumosa, enveloped 

 in a thick cotton-like secretion. 



Sept.-Oct. St. Fouis, Mo., Springfield, Mo., Neosho City, 

 Mo."* 



See Fig. 134. A slide lent by Mr. Monell labeled "43" con- 

 tained a specimen collected October 11, 1876, has a wing ex- 

 panse of 4.4 mm. and antennal measurements I, 0.035 mm. ; 

 II, 0.035 mm. ; III, 0.2 mm. ; IV, 0.07 mm. ; V, 0.06 mm. ; VI, 

 0.055 n^"^- 



The return migrants {sexvtparce) on leaves of Leersia vig- 

 ginica and specimens alighted on bark of elm, lent me by Mr. 

 Sirrine accords with material lent me by Mr. Monell. 



The pupcB on Leersia virginica (Sirrine material) have a 

 6-jointed antenna with III about as long as IV-j-V. IV, V, 

 and VI are subequal. This accords with the pupal antenna of 

 T. graminis (colophoidea.) 



f generation. True sexes. Without beaks. Female: 



Antennae 4- jointed with a peculiar thumb-like projection on IV 

 (Fig. 181). Legs with long capitate hairs (Fig. 182). Length 

 0.55 mm. Male shorter; more slender. Described from bal- 

 sam mounts lent by Mr. Sirrine of material taken on bark of 

 Ulmiis americana, I. A. C. io-4-'92. 



Biological. 

 A single stem mother occurs in each gall and her progeny up 

 to the time of the migration (July 8-14, 1909, Orono, Maine) 

 are about 70 in number, consisting in nymphs (destined to be- 

 come winged) ; pupae, and newly winged forms. At this time 



*Can. Ent. Vol. XIV. Jan. 1882, p. 16. Original description quoted 

 entire. 



