ON THE ORDER THYSANOPTERA. 145 



Genus I. — Phl.eothrips. 



In the pupa the antennae are applied to the sides of the head, form- 

 ing a regular margin. The close resemblance of Phi. ulmi to 

 another very common species, makes a fuller description of each 

 necessary. 



Sp. 3. Phi. ulmi. Piceo-tiigra antennarum artiado 3 tio . toto 

 sequentibus basi jlavo-pallidis ; tibiis bast apiceque anticis 

 tolis tarsisque ferrugineis ; femoribus anticis incrassatis ; 

 pollice distincto. Mas, subaptera: fem. subaptera, vel 

 alata elytris subflavescentibus. 



Larva much depressed, white ; the head, a bilobed spot on the pro- 

 thorax, the last two segments of the abdomen and a lateral spot 

 on the preceding one, black. A few black dots on the thorax. 

 Antennas black, with the base pale. Pupa white, with a few red 

 dots on the thorax, and in the place of the simple eyes. Some- 

 times a faint reddish tinge in parts of the abdomen. The ptero- 

 thecae extend to the middle of the abdomen. The insects disclosed 

 from these pupae had perfect wings, but the subapterous indivi- 

 duals are more numerous. 

 Inhabits under the bark of dead trees, elm, ash, &c. 



Sp. 3". Phi. pini. Prcecedenti simillima, sed magis elon- 

 gata. Mas, subaptera : fem. subaptera, vel alata elytris 

 extrorsum infumatis. 



The eggs are milky, or bluish white, about ^ of an inch in length, 

 by ~ diameter. They are cylindric, with each end equally rounded, 

 thus differing from those of Phi. statices. They are attached in 

 loose clusters to the bark, and hardened by a gummy wash, soluble 

 in water, by the application of which they are detached, and be- 

 come flaccid. The larva is longer and less depressed than that of 

 Phi. ulmi : of a red flesh colour, with the head and feet paler ; 

 the body is thickly freckled with bright red on a paler ground, 

 which produces the general tint. The last two segments of the 

 abdomen are black ; also the antennae, which have the base pale. 

 Very young larva? are of a dirty watery tint, with the antennae and 

 tail black. The antennae are then proportionally larger ; the ab- 

 domen small and attenuate, the hairs of the body very long and con- 

 spicuous. The pupa is very pale flesh colour, the red dots being 

 fewer : the head whitish, with a reddish patch in the middle : the 

 legs and last two segments of the abdomen white : the fore-thighs 

 very little thickened. The pterothecaj were very small in those 



