A remarkable case of nialformation of the discall cell in a specimen of I,i o g m a g 1 a b r a t a. BY C. R. O a t e n S a c k e n . 111 August 18!B I caught in hiissee (Styria) a Tipulid which is undoubtedly Cylinti'rntoi-~zrr g2nlnwtn Schin. 11, p. 563 (whether it is ihe w n c as Lin?nobi(r glnbmtn Mcig. 1, p. 142 is probable, bnt not certain, as I shall presently show). In this specimen ihe discal cell is open, in conseqiieiice of thc complete disappearahce of the crossvein which separates

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... t from the first has21 cell. Oil both wings, thc strrictrire is exactly the snmc, and thr adjoining veins forming the tliscal cell (the posterior branch of thc third vein and the fourth