COLLEMBOLA OF THE FAMILY ISOTOMIDAE 115 



ISOTOMA aSOTOMA) VIRIDIS Bourlet POMONA, new variety 



Plate 37. Figure 436 



Description. — Yellow marked with black (in alcohol). The color 

 pattern is essentially as in plate 37, figure 436, which represents a 

 heavily pigmented individual. In this figure the insect is sHghtly 

 flattened dorsoventrally. Antennal bases black; between and behind 

 them is a triangular yellow spot. Vertex with a large roughly U- 

 shaped spot. A median dorsal interrupted yellow stripe may or may 

 not extend for the length of the body, but is constant on the mesono- 

 tum and metanotum. The lateral black spots on the segments fall 

 into a wide irregular stripe on each side. Most of the body segments 

 are each bordered posteriorly with a black band. First antennal 

 segment with a dorsal black spot. Coxa with a black band. Furcula 

 unpigmented or nearly so. Length, 4 mm. 



Half-grown individuals are mostly yellow, with the dorsal black 

 markings separated into pairs by a continuous j'^ellow median dorsal 

 line. The mesonotum and metanotum are bordered laterally with 

 black, forming a stripe which may continue back along the abdomen 

 for a variable cUstance. Coxa with a black band; legs otherwise 

 unpigmented. 



Cotypes.—U.S.^M. no. 42972. 



Distribution. — Recorded as follows: 



California: Claremont, H. Jones, S. Tyler. Indian Hill (Claremont region), 

 February, A. R. Payne. 



ISOTOMA aSOTOMA) SUBVIRIDIS, new species 



Plate 38, Figures 442-449 



Description. — Violet, mottled with pale spots. Antennae violet 

 throughout, or first segment pale basally. Legs pale violet. Furcula 

 white, with more or less pigment basally. Ocular spots elongate. 

 Eyes (pi. 38, fig. 442) eight on each side, the two inner proximal eyes 

 much smaller than the others. Postantennal organ (pi. 38, fig. 442) 

 oval, very thick-walled, as long as the diameter of an adjacent eye. 

 Antennae about twice as long as the head, with segments in relative 

 lengths about as 11 : 20 : 21 : 27. Sense organ of third antennal segment 

 (pi. 38, fig. 443) with a pair of curving rods subtended by a chitinous 

 ridge. Fourth antennal segment with curving olfactory setae, in 

 form much like the other setae. Third abdominal segment longer 

 than the fourth (as 11:9). Genital and anal segments not ankylosed. 

 Unguis (pi. 38, fig. 444) stout, almost straight, with a pair of lateral 

 teeth, two inner teeth, and numerous basal folds. Unguiculus 

 extending about one-half as far as the unguis, broadly lanceolate, 

 acute, strongly unidentate at the middle of the inner margin. Tenent 



