THE EUPODA, OR PHVTOPHAGA. 215 
yellowish-white stripes, which are sometimes divided 
into spots. The male of P.nodicornis, a linear bronze- 
coloured insect, most abundant on Reseda lutea (wild 
mignonette), is remarkable for the abrupt, flattened, 
and exceedingly conspicuous plate formed by the 
fourth joint of its antenna: ; and P. ochripes (Plate 
XV., Fig. 1), found on the Alliaria, is the most gaily 
ornamented in the genus. The striped species are 
often very troublesome to beginners, but are readily 
separated by the following characters : — vittula, very 
small and the most parallel, has an almost straight 
stripe, which is abruptly and obliquely sloped inwards 
at its upper extremity by the shoulder ; undulata, 
larger, and rather less straight-sided, has the stripe 
gently hollowed out or waved in the middle on the 
outer side, and slightly and gradually sloped off at the 
shoulder ; nemorum, usually considered as the “ Turnip- 
flea, ” though not nearly so common as undulata, is 
more coarsely punctured and larger still, and has yel- 
low tibiae, — the same parts in the latter insect being 
infuscated ; tetrastiyma is largest of all, very shining 
black, more convex, and with its stripes (which are of 
a darker yellow) much contracted in the middle, often 
quite divided, and forming four large spots ; sinuata, 
very rare (occurring in Suffolk on horse-radish) ; 
resembles a small undulata, but has the stripe notched 
very abruptly both in the middle of the outer side, 
and at the shoulder ; ocliripes has entirely yellow legs, 
and the fifth joint of the antennas enlarged in the 
male; and brassicse, the least of all, has four yellow 
spots, and resembles a very small tetrastiyma, being, 
however, more globose. In this species, also, the fifth 
joint of the antennae is somewhat thickened in the male. 
