The Phalangiincp of Illinois. 85 



tubercles partially replaced by hairs. Apical portion of ovi- 

 positor white, with no dark rings. 



Described from many specimens. Collected by the hun- 

 dred in Champaign county at all times between the latter part 

 of June and early in November. Also taken at various dates 

 late in summer and throughout the fall in Edwards, Kankakee, 

 Lake, La Salle, McLean, and Morgan counties, in Illinois, and 

 received from Lansing, J^ichigan. 



This is by far the commonest species throughout the 

 northern portion of the State. It develops largely in the fields 

 and woods, and, when full grown, apparently migrates to the 

 vicinity of houses, barns, and out-buildings, where it sometimes 

 congregates in great numbers. I have found the young ones 

 very common in corn fields, among the leaves of the growing 

 plants, where I suspect they live upon the numerous small 

 insects drowned in the moisture contained in the bases of the 

 unfolding leaves. They become mature in June. 



I was at first much puzzled over this species because of the 

 great variation in the color of different specimens, and was 

 inclined to separate the series then at hand into two species. 

 Being able to find, however, no structural difference, and 

 noticing that the deeply colored specimens were the only ones 

 obtained late in autumn, and, also, that the light ones were only 

 taken early in the season {i. e., soon after they became adults), 

 it occurred to me that the color might vary with the age of the 

 individual. After examining hundreds of specimens collected 

 at various times between July and November, I became con- 

 vinced that such was the case, and the field observations of 

 the present season have verified the conclusion. 



L. vittatum, (Say). 



rhalanyium vittatum. Say, Jour, riiil. Acad. Nat. >Sci., Vol, II., 



p. 65. 



Wood, Commun. Essex Inst., A^'ol. VI., p. 



20. 



3. Body 7 mm. long, 4 mm. wide. Palpi 7 mm. long. 

 Legs : I., 44 mm ; II., 89 mm.; III., 45 mm.; IV., 64 mm. 



Dorsum reddish brown, with a central dark marking com- 

 mencing at the eye eminence and extending caudad to the 



