Packard.] 
540 
[Feb. 19, 
probably leptinoides , though the caterpillars are so different when 
full} 7 fed. On the other hand, though we do not know the earliest 
stages of the other species of Schizura, yet from our knowledge of 
those of Dasylopliia anguina , there seems little doubt that the ge- 
neric characters are quite clearly indicated in the first stage ; that 
is, it will always be easy to separate Schizura larvae just after hatch- 
ing from those of any other genus of Notodontians, while if spec- 
imens of S. ipomece and unicornis of the first stage were mixed 
together, it would be almost impossible to safely separate them 
according to the species ; the incipient specific characters actually 
existing being too slight and indecisive. 
PARTIAL LIFE-HISTORY OF SCHIZURA LEPTINOIDES (GROTE). 
I am indebted to Professor Riley for an opportunity of examin- 
ing four alcoholic specimens representing the three earliest stages 
of this species. I have compared them with the equivalent stages 
of alcoholic specimens of S. ipomece. 
First stage. — Length 4 mm. The larva of this stage is very sim- 
ilar to that of S. ipomece, the shape of the head, of the tubercles, 
dorsal and lateral, and of the peculiar paddle-shaped glandular 
hairs being identical. I can only perceive a difference in the slight- 
ly smaller dorsal tubercles, especially those on the eighth and 
ninth abdominal segments. There are probably slight differences 
in color, but Professor Riley’s specimens are faded out from long 
immersion in alcohol, so that it is impossible of course to say how 
the two larvae differ in color until the two forms have been com- 
pared in the living state. 
Second stage.— Length 7 mm. Of the same size as S. ipomece 
of the same stage. The tubercles do not differ in shape or in size. 
The specific differences (besides those of color, about which I can- 
not ascertain) are that the two vertical lobes of the head are more 
acute than in S. ipomece , while the surface seems to be less dis- 
tinctly marked. Moreover, the paddle-shaped glandular setae are 
decidedly shorter. By these marks alone, alcoholic specimens of 
the larvae of the two species of the present stage can be easily sep- 
arated. 
Third stage. — Length 11 mm. The same differences, obtain as in 
the preceding stages. The vertical lobes of the head are more 
acute in S. leptinoides than in S. ipomece , while the setae, now less 
flattened at the end, are in shape like those of the third stage of 
