844 



Pomona College JorRXAL of Entomology 



and the /. besselsii (Packard) but with apparent diiferenees. They resemble 

 the /. minima perfei-tly except for the position of the teeth on the inuerones. 

 Because of tliis important difference I have provisionally classified mine as 

 /. besselsii. 



Len<;th .To.l mm. CoJeir — Hrown, yellow at junction of segments, fur- 

 cula and legs light; ventral side dark. Body — Subeylindrical, sparsely 

 haired. Head — Elongate. Antennte (A) about as long as head, segments 

 four; I shortest, IV longest, II and III subequal ; different from those de- 

 scribed by JIaegillivray. "First and second segments dilated, as broad as 

 long and twice as broad as the third or fourth." In my specimens, I is as 



Figure 270. Isotoma besselsii Packard, A to I). 



.•\, antfiina; I*, claws; C, dcntcs anil mucroiios: D, imicroncs; E. niucroncs of 



I. minima, after Guthrie. 



bi-(iad as lona', Imt tliis is nut true of II. Also 1 and II are not as broad as 

 111 and l\'. Ocelli, sixteen. Thorax — Segments not fused. Joints of legs 

 same as /. hiili iil ii iiln : tenant hairs on tibia; claws (Hi um-urved: superior 

 claw wide al the hjise but narrow at the ape.x : inferior claw with inner 

 margin dilated at base. Ahdoiiii ii — Segments sul)ei|ual; W . V and VI 

 appear to be fused. Kureula sluirl, stout, not reaching xcntral tube; manu- 

 brium slightl.v longer than denies ; miicrones (D) tridentieulate ; distal tooth 

 long and but little I'lirved; second and third teeth of about the same length, 

 vertical, on opposite sides of the nuicrones and nearly opposite each other. 



