gees 
to that of the adult, the spines being, however, more numerous and less 
prominent. The lateral armature is sometimes almost wanting, but oc- 
casionally occurs to the amount shown in the figure (Fig. 49 d). The 
dorsal armature is much more scanty, and is either limited to the first 
and second joints or frequently entirely wanting. 
Fourth stage.—The fourth and last larval stage is shown with char- 
acteristic armature at Fig. 49 g, 7, dorsal and lateral views. Its chief 
difference from the larva of bovis, as 
already shown in the tabular state- 
ment, is that the penultimate seg- 
ment ventrally and also dorsally is 
spinose, as the preceding ones on the 
posterior margin while in bovis it is 
distinctly unarmed. The full-grown 
larva when escaping from the back is 
of a grayish-white color and ranges in 
length from 22 to 25 mm. 
PUPARIUM.—Once out of the back 
the larva rapidly darkens and con- 
tracts, and the puparium, which is 
merely the contracted and hardened 
larva, becomes dark brown, almost 
Fig. 50. HYPODERMA LINEATA—female, nat- black, but otherwise possesses all the 
ural size indicated by side line (original). superficial characteristics of the larva. 
Imaco.—Length $ inch (2 with ovipositor extended); general color, 
black; body more or less densely clothed with yellowish-white, reddish, 
and brownish-black hairs. The front, sides, and 
back of the head, the sides of the thorax, a band 
across the base of the scutellum and the basal 
segments of the abdomen, are covered with long, 
yellowish-white almost white, hairs. The head 
above, central thoracic region, including prothorax 
and mesothorax, middle segments of the abdomen 
above, and legs, clothed with brownish-black 
hairs, which on the head and thorax are more or 
less intermixed with whitish hairs. The covering 
of hairs is shorter and scantier on the head and 
thorax and the tip of the scutellum and follow- 
ing parts of the thorax, together with four promi- 
Fig. 51.—HYPODERMA LINE’ nent raised lines on the thorax, indicated in the 
ATA—ovipositor ot female: E f : 7 
a, from side; b, tip, frombe- Atawing by high light, are smooth and highly 
low—enlarged (original). polished. The hairs of the terminal segments of 
the abdomen are reddish-orange, which color also predominates on 
the hind tibie. (See Fig. 50.) 
OR ita Sh ge we 
