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Show 1885.] MR. JACOBY ON N E W PHYTOPHAGOUS COLEOPTERA. 925 did not show this supposition to be erroneous. The extreme delicacy aud fragility of the specimen has unfortunately resulted in tbe loss of nearly all the appendages, and the specimen is broken in half. It is not merely, however, the thinness and absence of calcification in the integument that makes this species so brittle ; the muscles, both of the appendages and of the segments themselves, are so little developed that it is almost impossible to detect their presence with the unaided eye. This is the only family of Isopods in which I have observed a similar feeble development of the musculature, which is well known to be characteristic of many deep-sea fishes. Eurycope fragilis approaches E. pellucida in the transparency of the integument, and in the third species, E. abyssicola these peculiarities are even more developed; the specimen, however, is so collapsed and damaged that it is impossible to say much about it. 4. Descriptions of some new Species and a new Genus of Phytophagous Coleoptera. By M A R T I N J A C O B Y. [Eeceived November 27, 1885.] DORYPHORA PR^TEXTATA, Sp. 110V. Below piceous; above pale green. Head and the disk of the thorax piceous, closely punctured ; elytra closely geminate, punctate- striate, a sutural stripe widened at the middle, piceous. Length 4\ lines. Head finely and closely punctured ; labrum fulvous; antennae black, the three lower joints testaceous below, the apex of the terminal joint fulvous. Thorax very finely and rather closely punctured, the sides slightly rounded in front, nearly straight at the base, the angles acute but scarcely produced : a large piceous patch, widened at the base, occupies the middle of the disk. Scutellum piceous. Elytra rather finely punctate-striate; the punctures arranged in slightly irregular double rows, with the exception of the last row, near the lateral margins, which consist of single punctures only; the sutural longitudinal piceous stripe is distinctly widened at the middle, and gradually narrows towards the apices; the meso-sternal process short and straight. Hab. Amazons, St. Paulo d'Olivenca. (Coll. Oberthiir and my own.) This species may easily be mistaken for a variety of D. trivittata, Baly, in which the lateral elytral stripe is wanting; but the double rows of punctures of the elytra show it to be distinct. In D. trivittata, as well as in D. citrinella, Kirsch, the elytra have single rows of punctures ; the same is the case in D. vespertina, Baly, another closely allied species. DORYPHORA GRATIOSA, Sp. 110V. Black. Head, thorax, and antennae dark piceous, the four last joints of the latter fulvous ; elytra pale green, finely punctate-striate, P R O C ZOOL. Soc-1885, No. LX. 60 |
