A Classification of Leindopterous Larvae. 219 



representing the subdorsal process), two on joint 4, one a little 

 above the other, none on joint 5, one each on joints 6 to 12. Spira- 

 cles small, round. Color of body and processes varying in different 

 individuals from tan color to red or dark brown, like different kinds 

 of withered leaves. Below spiracles, nearly white ; venter clear 

 pale yellow, semitransparent. Thoracic feet small, colorless. 



Are these flesh}^ arms intended to come off in the grasp of an 

 enemy, like the tail of a lizard, whereby the larva may escape injury, 

 even though it be detected in its simulation of a dead leaf? 



In respect to the number of tubercles and their armature, P. inthe- 

 cium is the most generalized larva of the Eucleidse, the nearest to 

 Megalopyge. 



Phobetron tetradactylum Walsh. 



If the observations of Walsh are not founded upon error (of 

 which I am by no means convinced) we have another species of 

 Phobetron in this country which has escaped the notice of entomo- 

 logists. Walsh says: "These larviE were much larger than that 

 of hyalinus^'' (which means nothing, as hyalinus is the % of pithe- 

 cium, and consequently small). "They agreed with it in having- 

 apparently nine pairs of appendages, the last pair very short ; but 

 they had only the 3d and 6th pairs projecting beyond the others, 

 and both these .pairs were curved backwards, with the extreme tips 

 of each slightly hooked forward." I have shown that the direction 

 of curvature of the arms cannot be relied upon, and it remains to 

 be determined what is the range of variation in the proportionate 

 lengths of the several pairs of arms before we can pronounce on 

 Walsh's species. 



Sisyrosea inornata Grote aud Robinson. ' 



Here also the tubercles remain ; but the hairs are soft and with- 

 out stinging power. The larva is colored for concealment. 



Head pale green, eyes black, jaws brown ; head under joint 2, 2 

 under 3. Body much flattened, elliptical, dorsal region flat, rising 

 but little, narrowest centrally and widening to the extremities ; sides 

 sloping. Around the lateral region the body projects and bears a 

 row of flattened, elongated, triangular, pointed projections, fringed 

 on their sides by spines each tipped with a hair. The first of these 

 projections is on joint 3 at the beginning of the subdorsal ridge, 

 which, with the one on 3 laterally and 4, is red with black spines. 

 (There is one on 3 subdorsally, another small one on 3 laterally, 

 one on 4, none on 5, one on G, but no gap as joint 5 is contracted at 



