BRISTLE-TAILS AND SPRING-TAILS. 105 
. ventral sucking disc; the dotted lines passing through the body 
represent the course of the intestine; b, end of tibia, showing the 
tarsus, with the claw, and two accessory spines; @, third joint of 
Fig. 34. the spring. Fig. 32, lacinia of maxilla 
ə greatly enlarged. Fig. 33, different 
forms of scales, showing the great vari- 
ation in size and form, the narrow 
ones running into a linear form, be- 
coming hairs. The markings are also 
seen to vary, showing their unreliable 
character as test objects, unless a 
single scale is kept for use.) 
Lepidocyrtus Bourlet. Abdominal 
segments unequal, with simple hairs 
and scales. Antenne long, four- 
jointed. Eyes eight in number on 
Lepidocyrtus albinos. each side. Fig. 34, L. albinos, an 
European species, from Hardwicke’s *‘ Science Gossip.” Fig. 35, a 
scale. Two species in New England.) 
Podura. Abdominal segments subequal. Hairs simple, no 
scales. Antenne four-jointed, shorter than the head. Eyes eight 
in number on each side. Saltatory appendage of moderate length. 
Achorutes Templeton. Abdominal segments subequal. An- 
tennæ short, four-jointed. Eyes eight in number on each side. 
Saltatory appendage quite short. 
Fig. 36 represents a species of this genus very abundant under 
the bark of trees, ete., in New England. It is blackish lead color ; 
a, end of tibia bearing a tenant hair, with the Fig. 35. 
tarsal joint and large claw; b, spring; ĉ, the ae 
third joint of the spring, with the little spine at 
the base; fig. 37, the supposed ovipositor ; 4, 
the two blades spread apart ; b, side view. ek 
mouth-parts in this genus are much as in Tomo- W 
cerus, the maxillæ ending in a lacinia and palpus. 
The two remaining genera, Lipura and Anura, 
are placed in the “family” Lipuridæ, which 
have no spring. Lubbock remarks that ‘this 
family contains as yet only two genera, Lipura (Burmeister), in 
which the mouth is composed of the same parts as those in the 
preceding genera, and Anura (Gervais), in which the mandibles 
