T])e PhaJdngilmc of lUinois. 95 



anterior border by a space wider than (often nearly doable) its 

 diameter. Lateral pores large, oval, submarginal. Anal piece 

 quite large, wider than long, at least as wide as the bent bor- 

 ders of the eighth segment, rounded before, its posterior border 

 truncate and slightly curved. Mandibles quite short, and nor- 

 mal in both sexes; first article provided below at the base with 

 a pointed tooth, slightly curved in front. Palpi, inner surface 

 of the extremity of the femur, patella, and tibia thickly fur- 

 nished with hairs forming a brush; upper internal angle of the 

 femur and jiatella slightly projecting, rarely prolonged; patella 

 slightly shorter than tibia, enlarged from the base to the 

 extremity; maxillary lobe having at the base two conical 

 tubercles. Maxillary lobe of the coxa\ and feet as in Phalan- 

 (jiHin. 



O. pictus, (Wood). 



riuilangium pictuin. Wood, 1. c, p. 30. 



$. Body 6 mm. long, 3.2 mm. wide. Palpi 4.1 mm. long. 

 Legs: I., 10 mm.; IL, 24 mm.; III., 12 mm.; IV., 17 ram. 



Dorsum minutely scabrous, 

 mottled ash-gray, much lighter 

 in some specimens than others. 

 Dark central marking generally 

 very distinct, commencing at the 

 cephalic border of the cephalo- 

 thorax, the dorsal surface of 

 which it almost covers, and sud- 

 denly contracting at its caudal 

 margin, so that it starts on the 

 abdomen as a narrow line, slightly wider than the eye eminence, 

 then gradually expanding until it reaches the end of the cephalic 

 third of the abdomen, where it suddenly contracts, its borders 

 irregularly curving toward the dorso-meson, then expanding 

 again,— though not becoming as wide as before, — and finally 

 gradually contracting and running as a stripe to the anus, or, 

 as in some specimens, simply terminating at the cephalic mar- 

 gin of the penultimate segment. Cephalic margin of cephalo- 

 thorax nearly straight, lateral angles slightly produced, each 

 having a black spine on an elevated base; three large brownish 



