478 EXTERNAL ANATOMY OF INSECTS. 
this tribe, related to Aszda, there is a deep anterior 
sinus; in Blaps the anterior margin is concave; in Schi- 
zorhina* Brownii, and atropunctata (forming a distinct 
genus), it is bifid: it varies in the Scarabeide, in 
some being bidentate, in others quadridentate, and in 
others again sexdentate, including the cheeks: in Myla- 
bris, a kind of blister-beetle, it is transverse and nearly 
oval; in Lamia, a Capricorn-beetle, it represents a pa- 
rallelogram ; and in most Orthoptera it is obtriangular : 
in Cicada it is prominent, transversely furrowed, and 
divided by a longitudinal channel: in Otiocerus it pre- 
sents the longitudinal section of a cone?: in the Diptera 
Order, with the exception of the Tzpulzde and some 
others, in which it unites with the cheeks, &c. to form a 
rostrum, the nose in general, as to form, answers to its 
name, resembling that of many of the Mammalia: in 
some of the Asilid@ it is very tumid at the end, and ter- 
minates in a sinus, to permit the passage of the proboscis 
to and fro: in many of the Syrphida, &c. it is first flat 
and depressed, and then is suddenly elevated, so as to 
give the animal’s head the air of that of a monkey: in 
some tribes, as Rhingia, Nemotelus, Eristalis, &c., in 
conjunction with the cheeks it forms a conical rostrum ; 
in Tabanus bovinus, and other horse-flies, it terminates 
in three angles or teeth. Many more forms might be 
mentioned, but these will suffice to give you a general 
idea of them. In szze and proportions the nose also va- 
ries. It is frequently, as in Cicada, the most conspi- 
cuous part of the face, both for size and characters; but 
* Cetonia Brownii, Kirby in Linn. Trans, xii. 464, t, xxiii. f. 6. 
Ibid: xiv. 570. 
> Ibid. xiii. 41,1. 6. 
