92 Wisconsin Academy of Sciences, Arts and Letters. 



ATTUS CAUTUS Nov Sp. 



S Juv. Total length' 4. 5 mm. Width of abdomen 1.6 mm. 



Cephalotliorax: length 2, width 1.5; height 9. 



Legs 3, 3.3, 3.7, 4. Cephalotliorax much longer than j)atella and tibia of 

 the first; patella and tibia of the third shorter than patella and tibia 

 of the fourth; j)atella and tibia of the fourth and metatarsus and tar- 

 sus of the fourth equal. 



Cephalotliorax moderately high, shghtly convex, a little contracted behind, 

 with sides vertical in front and rounded behind; cephalic part shghtly 

 inclined; thoracic falling gradually in the first two-fifths, then steeply. 

 Ocular area occupying nearly one-half cephalothorax, one-third 

 wider than long, equally wide in front and behind. Anterior eyes 

 sub-touching, in a slightly curved row, the middle twice as large as 

 the lateral eyes; eyes of second row halfway between lateral and dor- 

 sal eyes; dorsal as large as lateral eyes, a little further from each 

 other than from lateral borders, forming a row as wide as cephalo- 

 thorax at that place. ClyiJeus inclined backward, one-third as high 

 as middle eyes. Falces as v,dde as the two middle eyes, as long as 

 face, vertical, parallel. Maxill83 enlarged and blunt at extremity, 

 parallel. Labium two-thirds as long as maxillae, perhaps a little longer 

 than wide, contracted and rounded at tip. Sternum one-fourth 

 longer than wide, truncated in front. Anterior coxae separated by 

 more than width of labium. Legs of the first and second pau's slightly 

 stoutest; femoral, tibial and metatarsal spines on the four i^airs; met- 

 atarsi of the fourth spined throughout their length. 



Coloration: Cephalotliorax black with lower sides white, a white band 

 above anterior eyes, another behind dorsal eyes, and a white spot in 

 the middle of the cephalic part. Clypeus and falces covered with 

 white hairs. Abdomen with the anterior third and the apex black, 

 while the remaining portion is covered with bright yellowish brown 

 hairs; there are four transvere ^vhite bands; two cross the anterior 

 black region, one the brov^^n region, and one separates the brown 

 from the black region at the apex. Palpi light brown with thin white 

 hairs. Mouthparts and coxae light brown or pale. Sternum dark 

 brown. Venter brov>Ti with a whitish longitudinal band on each 

 side. Legs brown with blackish bands and some short white hairs. 

 Not wishing to found a new genus upon an immature specimen we put 



this species in the genus Attus Walck. 

 Habitat: Mexico. 



