REVISION OF STREPSIPTERA PIERCE. 161 



borne on apical truncation of the preceding, elongate, tapering, 

 sensitive. Prothorax anteriorly convex, fitting into excavation of 

 head. Wings as in Pentoxocera. 



Type of genus. — Halictophagus jacobsoni Meijere 190S. The genus 

 is typically parasitic on Fulgoridae and at present is confined to Java. 



i. NEOCHOLAX JACOBSONI Meijere (1908). 



Halictophagus jacobsoni Meijere, 1908. 



Parasitic on a fulgorid, Semarang, Java, June and July, 1905, 

 Edw. Jacobson (pi. 14, figs. 1, 2, 3, 4). 



Male. — Head dark brown; antennas brown, somewhat trans- 

 parent, the rami of decreasing lengths, the last joint scarcely longer 

 than the branch of the preceding, as in Pentacladocera schwarzi. 

 Mandibles brown. Thorax and abdomen grayish brown, the thorax 

 brighter. Prothorax strongly arched forward. Head emarginate 

 at base. Tibias brown; tarsi brighter, golden. Elytra dark brown. 

 Length 1.3 mm., wing length 1 mm.; antennal length 0.4 mm.; 

 length of branch of third antennal joint 0.26 mm., the last antennal 

 joint 0.16 mm.; breadth of head 0.52 mm.; length of palpus 0.14 mm. 



Female. — Cephalothorax golden brown, behind the opening of 

 the brood canal dark brown, scarcely broader than long (0.28 mm.); 

 sides rounded, head convex, behind the protuberant parts a small 

 darker median stripe. 



Triungulinid. — Similar to that of Pentoxocera, sides almost parallel, 

 the whole appearance somewhat oval. Length 0.13-0.16 mm.; 

 breadth 0.06 mm.; length of bristle of last segment 0.09 mm., or 

 more than half as long as the body. On the venter of the next to 

 last segment are three pairs of bristles, of which the middle pair are 

 shortest, the next longer, and the outer pair still longer; each ventral 

 segment bearing on apical margin three short hairs arranged in longi- 

 tudinal rows. Eye-spot with five pigment lenses arranged in a cross. 



Male puparium. — The diameters of the cephalotheca are 0.5 mm. x 

 0.4 mm. a 



a Male.—Kopi schwarzbraun, Piihler braun, etwas durchsichtig, die Anhansre in 

 abnehmender Lange, das letzte Glied kaum etwas langer als der Anhang des vorletzten, 

 also wie bei H. (Pentacladocera) schwarzii Perk, gebildet. Taster braun. Thorax und 

 Hinterleib graubraun, der Thorax an den Nahten heller. Prothorax in der Mitte massig 

 vorgebuchtet, Kopf hinten im oberen Teile ausgehohlt. Beine braun, Tarsen heller, 

 gelblich. Elytren schwarzbraun. Flugelgestalt und Geader wie in fig. 3, 3te Haupt- 

 aderalsoeinfach. Korperlange 1.3 mm. ; Fliigellange 1 mm. ; Lange der Fiihler 0.4 mm. 

 Lange des Anhangs des 3ten Fuhlergliedes 0.26 mm., des letzten Fiihlergliedes 0.16 

 mm. Breite des Kopfes 0.52 mm. Lange des letzten Tastergliedea 0.14 mm. 



Female.— Kopf gelbbraun, hinter dem Querspalt dunkelbraun,- kaum etwas breiter 

 als lang (ca. 0.28 mm.), die Seiten abgerundet, der vor der Quernaht liegende Teil 

 convex. Hinter dem heraustretenden Teil kein dunkler Medianstreifen. 



Triungulinid.— Die winzigen Larven stimmen sehr mit den bei Perkins abgebilde- 

 ten von Bruesia (Pentoxocera) uberein, sie sind bald parallelseitig, bald von mehr 



