WILLIAMS: HABITS OF SCUTIGERELLA. 
483 
may have been Scolopenclrellas. Herewith are given three drawings 
(pi. 38, fig. 12-14) of a recently hatched larva of undetermined 
species which may be a young Seolopendrella. There are adults of 
this genus which have but eleven pairs of legs (Grassi, Hansen). In 
the side view of this larva, one may notice a distinct elevation or 
papilla on the body in the place of the first pair of legs. Behind this 
there are six pairs of legs, which are free and a seventh, in an ad¬ 
vanced stage of development. This animal hatched with ten antennal 
joints instead of six. It has the same ten dorsal scutes and is much 
like the Scutigerella larva, except in being more delicate and slender. 
Summary and Conclusions. 
Scutigerella immaculata has been found to lay eggs and hatch young 
in the latitude of southern Ohio during late May and early June. 
The time of laying is influenced by the temperature. 
The adult Scutigerella is needed (at least in the laboratory) to keep 
off destructive fungi from its eggs so that they may hatch. 
The egg of Scutigerella is covered by a vitelline membrane and a 
much ridged chorion. 
In the pairs of legs (7) and number of dorsal scutes (10), the larva 
of Scutigerella immaculata is hatched more nearly like the adult than 
any Diplopod of which I can ascertain the embryology and more like 
the adult Scutigerella than the recently hatched Lithobius among the 
Chilopods is like its adult. It is, therefore, a highly specialized young 
rather than a generalized ancestral form such as the hexapod larva 
of other Diplopods is considered to be. 
Scutigerella is probably carnivorous. It appears to secrete a peri- 
trophic membrane about the contents of its mid-gut as do some of 
the lower insects. 
The first joint of a typical walking leg is moved bv five slender 
muscles which originate on the dorsal scutes. 
In its method of locomotion (but not the rate) S. immaculata re¬ 
sembles the Diplopods. 
In Scutigerella ecdysis probably precedes oviposit ion by a short 
space of time. 
The most common method of escape from the cast skin is by freeing 
the head and then creeping forward out of the old shell. This is not 
the only method. 
