THE HETEROMERA. 
225 
Tenebrio, the two species of which are known in their 
larval state as “ the meal-worm,” a favourite food for 
singing-birds. It has been remarked that meal-worms 
obtained from the east end of London usually produce 
T. obscurus ; whilst those from the west end produce 
T. molitor. The two larvae appear to be superficially 
much alike, except that in T. obscurus the colour is 
darker, and the last segment is rather longer, with 
more diverging terminal projections ; the pupae are 
not enclosed in a cocoon, and have the six first seg- 
ments of the abdomen furnished with flattened parallel, 
truncate appendages, the last segment being bifurcate. 
The larva of T. molitor is eyeless, elongate, nearly 
cylindrical, rather attenuate behind, light yellow in 
colour, with fine thin hairs on the sides, and marked 
with partly confluent minute dark spots on the upper 
side ; the apical segment is conical, and terminates in 
two slightly diverging projections, having a minute 
black spine on each side. 
The perfect insects are dull pitcliy-brown, elongate, 
and rather flat, specimens often occurring of a light 
reddish-brown colour. The inner lobe of their maxilhe 
is armed with a horny hook ; the apical joint of their 
maxillary palpi hatchet-shaped; the eyes largest on 
the under surface, and the anterior tibiae curved (espe- 
cially in the male). They sometimes fly to lamps, &c. ; 
attracted, like moths, by the light. 
The Ulomina ai'e here represented by a few incon- 
spicuous insects, of which the majority are doubtless 
imported, being found in flour, merchandise, &c. They 
have no trochantiua to the intermediate femora; and 
their eyes (which are in nearly all the species almost 
divided into two on each side) have their greater bulk 
Q 
