Orseolia caulicola Gagné

[Figs 27 a–g]

Parallelodiplosis javanica Felt, 1921d: 91 .

Orseolia caulicola Gagné, 1973: 507, new name for P. javanica, (junior secondary homonymy); Gagné 1985: 139, revision.

Material examined. Lectotype male designated by Gagné (1985: 139), and male and 2 female paralectotypes, reared from leaf sheath gall on Sacciolepis indica (L.) Chase (as Panicum indicum L.) ( Poaceae) in Bogor, Java, Indonesia, vi-1920, Felt type #a3150. We examined the males which are mounted as whole, cleared insects on a single slide, with all characters preserved except the barely observable circumfila.

Description. Adult. Wing as in Fig. 27b. Palpus 4-segmented [Fig. 27c]. Tarsal claws simple, narrow, bent at distal third, as long as empodia [Fig. 27g].

Male. Flagellomeres as for genus [Fig. 27e], last flagellomere with apical extension [Fig. 27f]. Terminalia [Fig. 27d]: gonostylus short, strongly tapered, setulose except immediately next to distal tooth where carinate; cerci triangular, wide; hypoproct conical, slightly tapered; aedeagus narrow, as long as hypoproct, with several asetose sensilla on distal half.

Female. Tergum 10 with numerous short lateral setae, more similar to O. paspali than to less densely setose in O. oryzae [Fig. 31f], cerci as in O. oryzae [Fig. 31e] ( Gagné 1985).

Pupa, larva unknown.

Remarks. Orseolia caulicola is morphologically similar to O. oryzae and its close relatives O. eragrostisae (Mani), O. similis (Mani), O. difficilis Gagné and O paspali (Gagné 1985) .

Biology. This gall midge causes a leaf sheath gall on Sacciolepis indica (L.) Chase described by DvLR & DvL (1926) as Hymenachne indica Buese. (= Panicum indicum L), gall No 59, Fig 36. [Fig. 27a]). The slender white or greenish gall tubes develop chiefly in the inflorescences. Leaf buds grow between the flowers in the axils of the leaves of the flower stalks and the leaf ends of these buds change into galls. The galls occur also in axillary buds on the main stems and side branches.

Geographical distribution. This species is known from its type locality in Bogor, Java, where it was collected vi-1920 (DvLR & DvL 1926) .