^2 [February, 



in long series, two, for some uriaccotrntabliB reason, in far greater numbers 

 than the rest. My son notes that " the proper home of these Indian 

 insects is undoubtedly about the headwaters of the mountain-streams, 

 ■where the volume of water is less and the fall steeper, so that the spray 

 is sprinkled over the mossy boulders on which the Dianous are to be 

 found, at elevations between 6000 and 9000 feet, stray specimens only 

 occurring lower down the streams." Dianous is evidently far better 

 represented than Stenus in the hilly regions of Northern India, com- 

 paratively few species of the latter genus, and these mostly in very 

 limited numbers, having been obtained as yet in Almora ; but this may 

 b» due to the fact that very few Sieni are found about running water, 

 at least in Europe, S. guynemeri Jacq. Duv. (a very rugose insect, 

 not unlike some of the Indian Dianous) and 8. quttula Miill. being, 

 perhaps, the best known examples. 



The specimens sent (upwards of 500 in all), with the exception of 

 one or two of each species mounted in India, were all forwarded in glass 

 tubes, in diluted spirit, and they arrived in perfect safety. Those taken 

 from the tubes were in excellent condition for mounting and immediate 

 study, many of the males having the genital armatm*e extruded, so that 

 this portion of their structure could be seen in a number of the species 

 without dissection. The armature of the nine examined affords four 

 types of aedeagus or median lobe (simply pointed in six of the species, 

 and broad to the apex and otherwise shaped in each of the remaining 

 three) and less marked differences in the form of the very long, slender, 

 ciliate lateral lobes. 



I am indebted to Mr. H. E. Andrewes and Fleet-Surgeon M. 

 Cameron for the loan of the types and co-types of D. andrewesi and 

 D. versicolor. The types of the others here described will be placed in 

 the British Museum, which has not hitherto possessed a single represen- 

 tative of the genus Dianous from India, The dates of capture quoted 

 have been taken from the mounted set, no record having been kept by 

 me for the remainder. 



The opportmiity is here taken of inserting at the end of this paper 

 a description of a new species of the same genus from Che-kiang China. 



Table of the N. Indian Species <?/" Dianous. 



Elytra densely, very finely, unilbrmly punctured, alutaceous, the vestiture 

 somewhat variegate, tending to form spots or sinuous fasciae on disc. 

 Prothorax quadrinodose, deeply excavate laterally, the convex portion of 

 the disc shining, sparsely, minutely punctured ; upper surface of body 

 greenisli or brassy. 



