新 H 本 千 蟲圖解 , 
體長 二分、 此ハ小 笠 原 島-一 普通 ナリ、 
分布— 小 笠 原 島 (父 島)、 
N さめ ems (n. ヌ) 
Closly allied to Gerris F., 135 differs as follows : 
Body shorter and broader, spindle shaped, antennae much longer, somewhat shorter than the bodv, 4ュ11 and 5th joint 
subequal, 2nd somewhat shorter than 4ュ11. Pronotu ョ short, conical, only reaches the middle of the mcsonotunl- no humeral 
projection, mesonotum oval and somewhat shorter than the pl.onotum. No trace of henielytra and hind winsTS. Abdomen 
much shorter than the thorax. 
lyp-e : Neogerns b-oninensis n. sjx 
Neogerris tsninensis n. sp. (3. XI, Fi り-. lo 9). 
wody velvety fuscous brow? An incurved spot at the hind margin of the head, a spot near the middle of the pronotu ョ， 
the hind part of the mesonotum and the coxae yellowish brown, rronotsll at the hind margin, the gula, the prosternu ョ and the 
basal part of the anterior femur ochraceous. wocly beneath velvety gray, legs fuscous brown. 
Length— J sirs, 5 mm, 
Hab. Ogasawarajima (Bonh Island)， ョ any specimens collected びく the author. 
. H めみ づ むし 第 十 一 US' ^ 
學 名 p-clog^onus flavoniarginatus Scott. 
見蟲 學上ノ 地位 眼水蟲 科 (pclogollidac) 
C 100 
