chamberlin: the arachnida. 261 



Length of female 4 mm. 



Locality. — Paltaybamba, 5,000 feet, August. (Type, M. C. Z. 

 242, one female). 



MiCRATHENA CALa/ sp. nOV. 



Plate 20, fig. 5. 



Carapace brown, the lateral and caudal slopes of the thoracic part 

 dusky. Anterior pairs of legs dark brown, coxae and proximal ends 

 of femora yellowish; posterior pairs yellowish or light testaceous. 

 Sternum solid black. Abdomen above white of a slight yellowish 

 tinge, a dusky mark at each anterior corner and a spot or two in line 

 with this farther caudad; venter and lower portion of sides blackish, 

 the caudal end between apices of lobes also black. 



Abdomen bifid behind, each lobe ending in two spines, one above 

 the other; near base of lobe on each side a spinous point and one 

 farther forward toward anterior corner. 



Posterior row of eyes recurved as usual; median eyes just their 

 diameter apart, a little more than three times as far from the lateral. 

 Lateral eyes on each side nearly contiguous, the anterior somewhat 

 the larger. Anterior row of eyes recurved; median eyes slightly 

 smaller than the posterior medians, four fifths or a little less their 

 diameter apart, their diameter from lower margin of clypeus, more 

 than three times their diameter from the laterals. Area of median 

 eyes wider behind than in front in about ratio 15:13, nearly equal in 

 length and breadth. 



Sternum shield shaped; longer than wide nearly in ratio 7:6. 



Lower margin of furrow of chelicera with three teeth of which the 

 most proximal is largest. 



Spines on anterior face of femora longest. 



Length of female 5.3 mm. 



Locality.— Sein Miguel, 6,000 feet, July. (Type, M. C. Z. 243, 

 female). 



Gasteracantha raimondi Taczanowski, var. 



Horae Soc. ent. Ross., 1879, 15, p. 106, pi. 1, f. 25, 26. 



Previously known from various other localities in Peru and from 

 Brazil. 



Locality.— Huadquina, 5,000 feet, July. (M. C. Z. 246, one female). 



1 KaXoi, beautiful. 



