. Annals of the Entomological Society of America. Entomology. 1920] Ewing: Genus Trombicula Berlese 383 being variable. Palpi each with four inner tibial spines, the longest of which is equal to about half the length of the claw. Thumb of palpus not surpassing the claw. Abdomen with the usual constriction. Setae of abdomen much longer on the posterior margin than on the shoulders. Each seta is situated on a pedicel bearing disc, is strongly pectinate and usually stoutest at its tip, where the barbs are somewhat less con- spicuous. Legs rather stout, the anterior pair much the longest and large
. Annals of the Entomological Society of America. Entomology. 1920] Ewing: Genus Trombicula Berlese 383 being variable. Palpi each with four inner tibial spines, the longest of which is equal to about half the length of the claw. Thumb of palpus not surpassing the claw. Abdomen with the usual constriction. Setae of abdomen much longer on the posterior margin than on the shoulders. Each seta is situated on a pedicel bearing disc, is strongly pectinate and usually stoutest at its tip, where the barbs are somewhat less con- spicuous. Legs rather stout, the anterior pair much the longest and largest, the posterior pair reaching the tip of the abdomen. Tarsus I is one and sixty-one hundredths times as long as tibia I and is much thicker dorso-ventrally than laterally. Tarsus IV about one and a fourth times as long as tibia and with the outer claw slightly smaller and more strongly curved than the inner. Length usually from mm. to mm., but varies considerably; breadth from mm. to about Fig. 1. Trombicula coarctata Berlese; a, seta from dorsum of abdomen; X 900; b, dorsal view of cephalothorax, X 375; c, last two segments of right front leg, side view, X 125. Several individuals received from Dr. Miyajima from Japan. This species strongly resembles T. splendens Ewing, when examined superficially, but in reality is quite distinct. It is a blind species, whereas T. splendens has eyes, which, however, are not strongly developed and are easily overlooked. The posterior lobes of the pseudostigmatic area in the Japanese species are angulate and situated directly behind the pseudo- stigmata. In T. splendens these are evenly rounded and are situated approximate at the median line. In T. coarctata the pseudostigmatic organs arise from the pseudostigmata and are distinctly pectinate; in T. splendens these structures arise inside the pseudostigmata and are either simple or but very slightly pectinate. The body setae of the Japanese species are. Please note th
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