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282 ENTOMOLOGICAL NEWS [Oct., 'l8 



Forda formicaria Heyden (Plate XVI, figures 1, 2, 3 and 4). 

 Syns. : Rhizotcrus Tacca Hartig, Tychea graminis Koch, Forda occl- 

 dentalis Hart. 



Apterous specimens of this species sent to me by Air. F. Y. 

 Theobald, Wye, England, seem to be identical with one of the 

 common species upon grasses and in ant nests in this country, 

 and both agree well with the original description of fonnicaria, 

 and also with the description given by Mr. Hart, Eighteenth 

 Report of State Entomologist of Illinois, 1894, p. 95, for his 

 occidentalis; the latter name, therefore, along with Rhizotcrns 

 vacca Hartig and T. graminis of Koch, are probably syno- 

 nyms. 



Alate Summer Migrant. About June loth, at Fort Collins, 

 Colorado, the alate form begins to appear and to migrate from 

 the grass roots. At the end of about four to six weeks, the 

 entire colony become winged and leave the host plant, appar- 

 ently to seek others of the same sort. At least, we find the 

 lice later in the season upon grass-roots again, where they re- 

 main all winter, and we have not taken them upon other 

 plants. 



This early summer migrant may be described as follows: General 

 color of prothorax and abdomen sordid straw yellow ; head, meso- and 

 metathorax, antennae, a transverse line on pronotum, veins and stigma 

 of wings, entire legs, cauda and anal plates, a transverse band on each 

 abdominal segment and a small spot on either lateral margin of the 

 segments of the abdomen, black or blackish; at th'e center of the meso- 

 thorax above, a small yellow spot. 



Wings hyaline, cross-veins I and 2 of the fore wing unite at the base 

 and the third ends abruptly at basal one-third of length, all veins with 

 narrow blackish margin ; stigma short, stout, rounded distally, with 

 stigmal vein rising near the middle at the thickest part ; hind wing 

 with 2 transverse nerves, the second obsolete at base. 



Head and antennae well set with short, curved hairs ; head short, 

 broad, vertex slightly bi-lobed ; beak reaching hind coxae : antennal 

 joints I and 2 sub-equal, 3 about one-half the length of the entire 

 antenna; joint 4 somewhat longer than joint .s with the small spur; 

 joint 3 with about 30 oval sensoria extending along its entire length; 

 joint 4 with usually 2 sensoria before the large terminal one: joint 5 

 with a very large sensorium at base of spur. Cauda broadly rounded 

 and twice as broad as long ; see Plate XVI. figures 2 and 4. Length 

 2.70 to 3. ; antennae, .80 to .90 mm. 



