Attidce of North America. 41 



DENDRYPHANTES ALB0-I:MMACULATUS Peckham. 



Plate III, flfTure 29. 



Syn.: 1883. Attus alho-immacidatus P. , Descr. new or little known Attidae 

 ofU. S.,p. 5. 



$ . Total length 5 mm. Width of abdomen 2 mm. 



Ceplialothorax: length 1.8; width 1.3; height .8. 



Legs 3.3, 3.6, 3.4, 3.9; patella and tibia of the first, 1.1; patella and tibia of 

 the third, 8; patella and tibia of the fonrth, 1.4; metatarsus and 

 tarsus of the fourth, 1.3. 



Cephalothorax rather low, slightly convex, a rery little dilated at dorsal 

 eyes, sides almost vertical, posterior margin truncated; cephalic part 

 slightly inclined; ocular area occupying two-fifths of cephalothorax, 

 nearly one-third wider than long, wider behind than in front. An- 

 terior eyes small, in a slightly cuiwed row; middle eyes touching; 

 lateral a little less than one-half as large as middle eyes, separated 

 from them by one-half their own diameter; eyes of second row very 

 small, shghtly nearer the lateral than the dorsal eyes; dorsal a Little 

 larger than lateral eyes, further from each other than from lateral 

 borders, forming a row as wide as the cephalothorax at that i^lace. 

 Clypeus vertical, one-third as high as middle eyes. Falces as wide 

 as first row of eyes, twice as long as face, vertical, parallel; fang 

 short. Maxilla3 parallel, long, enlarged and rounded at extremity; 

 labium one-fourth longer than wide, one-half as long as maxillae, 

 contracted and rounded at tip. Sternum twice as long as wide, con- 

 tracted and truncated in front. Anterior coxse separated by nearly 

 the width of the labium. Femur, patella and tibia — especially tibia — 

 of the first enlarged; femur Avith a row of short and strong black 

 hairs near the middle of the lower border; patella with two cu-cles of 

 white hair separated by a hairless median part; the tibia has, on the 

 upper border, a short ridge of strong black hairs, and on the lower 

 border a longer ridge, the hairs below being as long as the articula- 

 tion is thick; metatarsus and tarsus slender. Weak femoral, tibial 

 and metatarsal spines on the four pairs, on the metatarsi of the third 

 and fourth only in tei'minal circles. 



Coloration: Cephalothorax and abdomen closely covered with short 

 white hall's, witli a few, scattered, long black hairs; clypeus, falces, 

 palpi, sternum, coxa? and venter covered with wliite hairs; mouth- 

 parts pale; first leg brown, excepting the tibia, wliicJi is black; other 

 legs light brown with longitudinal linos of wliite hairs. 



Habitat: Iowa, New York, 



