SOME NOTES ON THE ARTHROPODS OF MEDI- CAL AND VETERINARY IMPORTANCE IN MESOPOTAMIA, AND ON THEIR RELATION TO DISEASE. PART IV. SOME MESOPOTAMIAN NEMATOCERA OF ECONOMIC IMPORTANCE. BY Major W. S. PATTON, m.b. (Edin.), f.e.s., i.m.s., Director, Pasteur Institute oj Southern India. Illustrated BY EDITH M. PATTON. [Received for publication, May 25, 1920.] In this part of these notes, a few of the more important Nematocera of economic importance will be described : they are, however, incomplete, as it is impossible to record most of the Culicidae which were collected, as the specimens were so damaged that identification is now impossible. The Culicidae, however, are by no means so plentiful as may be supposed : indeed they are often conspicuous by their absence and are more or less localised in certain parts, where at times they become plentiful. Order Diptera : Sub-order Orthorrhapha : Nematocera : Family Chironomid^ : Sub-family Ceratopogonin^ : Biting Midges. It will be readily understood that in a country like Mesopotamia gxtensiyo areas of land adjacent to the rivers are in the early spring ( 245 )
