C 3io ) 
新 日本 千 蟲圖解 I 
Thereva ishikariana 3. sp. (PI. XX I, Fig. 4- と. 
Black. Vertex shining, front with black hairs, face densely white pubescsted, occiput with black bristles. Proboscis 
. upturned, fuscous, with brownish hairs. Antennae black, the third joint much shorter than the fkst. Thorax dark fuscous, with 
black hairs, with 2 grayish strbes, hi the middle of which with a black narrow stripe, on the sides and at the hina margin, as 
well as on the scutellum with short fulvous hairs. Wings subhyaline, with a shade of grayish brown, stigma, veins and their 
environs fuscous. Halteres fuscous, on the basal halves of the stems fulvous, .abdomen black, with blacl< hairs, on the sides 
yellowish pubescsted, the Srst 3 segments on each hind margin with fulvous hairs, the 2nd, 3rd and 4th segments each at 
the hind margin fulvous, which gradually becdalillg narrower towards the apex. Pygidium shining, 03 each sidew ith 6 fulvous 
t-ristles. Venter grayish white pruinose, the 2nd to ;,th segments each at the hind margin fulvous, whkn gradually becoming 
narrower towards the apex. Legs fuscous- tibiae and metatarsi, the both except the apices, -fulvous, coxae white, femora 
fulvous, tibiae and tarsi fuscous Est-escentecl, claws t-rown, p-ulvilli dirty yellow. 
Lentil 1 15 33. ； exp 21 mm. 
Hat-.— .Hoklsi-ao (saEJPOro) ； not rare. 
お ほそむ しひき 第二 十一 圜； は 
學 名 ILeptogaster basilans roq. 
昆蟲 學上ノ 地位 食 蟲虻科 . 
體" 黑色、 觸角" 晴褐、 第二 節及ビ 第三 節ノ 基部 ハ黃 揭、 口上 毛ハ 白色、 口吻 ハ黑 色、 其 基部 及ピ 
ト思 鬚ノ卞 《| ハ黄 锡、 額 及 ビ後頭 一一 白毛ヲ 装フ、 胸 背 一一 ハ 白毛ヲ 具へ、 雨 側 一一 ハ灰 白粉 ヲ装フ 後 
緣及ビ 兩角ハ 黄褥、 接狀部 一一 黃 ヲ 装フ、 翅ハ 透明、 少シク 黄色 ヲ 帶ビ、 脈及ビ 緣紋ハ 晴褐、 1^ 均 
