Quite a number of our Coleoptera are known to associate in their imago or perfect state with the Formicariæ—comprehensively, ants. Very little, perhaps nothing, is known of the larval and pupal life of any of these beetle. Some, like Batrisus bistriatus, probably never leave the ants; but others, like the species of Cremastochilus, desert them in the spring, whether afterwards to return and propagate among them is an open question.

We have seen, Can. Ent., xix., p.156 et seq., that the Bombycidæ, or Spinner Moths, are characterized, as a whole, by their short, pecitnate antennæ, ample, velvety wings, thich bodies, small heads and sluggish habit, while the pupa is usually contained in a cocoon made by the caterpillar in its last stage. To almost all these characters the sub family groups offer exceptions, and we have seen that while Dr. Packard follows the tradition of Harris, Latreille and Linneaus, modern German writers break up the family into independent groups limited by structural features taken from the imago.

April 28, 1887, a single larva of then unknown Catocal was found on a Honey Locust which proved to be this species. By its appearance it had seemingly passed the first moult. Hence the egg and first stage of the larva is lacking in this account of its life history. If my conjecture be true, my description will begin with the conventional “after the first moult.” Length .26 inch. Color pale greenish, the anterior two and posterior three joints whitish; four purplish red stripes on each side, the lower somewhat broken; head mottled, but not heavily so; piliferous spots black, with short black hairs. Shape as usual with Catocala larvæ. Duration of this period unknown.

Below I give an analytical table for recoginzing the genera in the tribe Chriopachides Thomspn. It will be seen that I have placed in this group the genus Schizonotus Ratzburg, which Dr. Arnold Foerster, in his Hymenopterologische Studien (1856), says is identical with Seladeram Walker, an opinion in which I cannot concur, my type of Schzonotus Siebaldi Ratz not agreeing at all with Walker's definition; also the genera Mesopolobus and Platymesopus Westwood, which were subpressed by Walker and other authorities, and placed in the genus Pteromalus; they agree in all essential characters with this group, the anterior femora being very similar to Chiropachys, the type of the tribe.

In this neighborhood (Custer Co., Colorado,) one very frequently finds a yellow spider of the genus Thomisus or allied thereto, seated in the middle of the umbels Ligusticum montanum Benth and Hook., and on other yellow flowers. This spider, so seated, has nothing to cover it from direct observation, and from its size and colour would be conspicuous enough elsewhere; but on the yellow flowe, sitting in the depression in the centre of the umbel, it is quite invisible unless specially looked for.