chamberlin: the arachnida. 227 



of abdomen with a large dark area of continuous dilute blue closely 

 covered with deeper blue spots, this area reaching to the spinnerets; 

 ventrally there is a moderately large quadrate area of brown in the 

 genital region. 



Posterior row of eyes with median eyes essentially contiguous with 

 the laterals as usual, separated from each other by a distance some- 

 what greater than their diameter (9:7), smaller than the laterals 

 (diameters as 7:10) which are about equal to the anterior laterals. 

 In dorsal view the anterior row of eyes is distinctly procurved; in 

 anterior view by their centres they are strongly procurved but with 

 upper edges in a straight line ; the median eyes are nearly contiguous, 

 separated by a distance clearly less than their radius, separated from 

 the laterals by a distance greater than their radius but less than their 

 diameter, (Plate 15, fig. 1). 



Chelicera of male without the usual tooth on the anterior face and 

 also lacking a true carina toward base; inner chitinous edge bent out- 

 ward at clypeal margin and showing as a dark chitinous line or ridge. 



Labium broad, distally truncate, (Plate 14, fig. 8). 



Sternum wider than long in ratio 6:5; the wide caudal margin be- 

 tween coxae of fourth legs convex, (Plate 14, fig. 8). 



Male. Length 4 mm. Length of cephalothorax L5 mm. (to edge 

 of clypeus) ; width L4 mm. 



fem. tib.+pat. met. 



Leg I 5.2 mm. 6 mm. 6.2 mm. 



Leg II 4.2 4.2 4.3 



Leg III 3.2 3.1 4 



Leg IV 4.6 5. 5 



Locality.— Urubamba, 9,500 feet, July. (Type, M. C. Z. 175, one 

 male). 



Aberrant in its genus in lacking any distinct tooth or true carina 

 on anterior face of chelicera but in other respects apparently conform- 

 ing to the genus in its typical form. The abdomen is higher than 

 usual. 



THERIDIIDAE. 



Argyrodes vittatus Keyserling. 



Spinnen Amerikas. Theridiidae, 1884, 2, pt. 1, p. 191, pi. 9, f. 114. 



One female of this species from San Miguel, 6,000 feet, July. 

 (M. C. Z. 176). 



