140 Mr. W. L. Distant on 53. Lateral face-marks ending above in an acute angle on orbital margin, above level of antennae simillima, Sin., $ . Lateral face-marks not ending above abruptly and not above level of an-tennae, tbe marks cuneiform 54. 54. Punctures of mesothorax large, lateral face-marks very broad. (Swan R.) . . ohtusata, Sm. Punctures of mesothorax very minute . . frederici, Ckll. (&i>m'lis, [Sm., preocc). XVIII. — Some undescribed Gerrinse. By W. L. Distant. The following aquatic Hydromelridse, belonging to the sub-family Gerrinse, are all from the waters and adjacent seas of British India. They represent the collections recently made by Dr. Annandale, who has paid so much attention to the fauna of the brackish and fresh waters of India, and also the oceanic species collected by the Indian Marine Survey. The new genera will be figured in the next and concluding volume of the Rhynchota of British India. Family HydrometridsB. Subfam. Germing. Div. Gerrinaria. G orris lepcha, sp. n. Body above and beneath black, beneath finely and more palely tomentose; antennae with the first, second, and third joints brownish ochraceous, extreme apices of the first and second, apical half of the thii d and the whole of the fourth joint black or piceous, the fourth palely sericeous ; anterior area of pronotum with a more or less distinct central longitudinal ochraceous fascia, remaining area piceous brown ; legs and rostrum brownish ochraceous, apex of rostrum black ; coxae and trochanters brownish ochraceous beneath; antennae with the first joint longest, second shortest, third and fourth almost subequal in length or fourth slightly longer than third ; head model ately convex, longer than broad ; pronotum with the anterior area or lobe with two small transverse linear callosities on disk ; posterior area or lobe rugulose and punctate, slightly transversely ridged between the humeral
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