COLLECTED IN DUTCH NEW GUINEA. 419 



In both these specimens the middle thoracic stripe is narrowed before the middle, 

 but not interrupted as it is in Walker's type of D. concisus ; nevertheless, I do not 

 think the specific identity can be in doubt, Osten-Sacken was evidently quite correct 

 in the synonymy which he gave for the species, but unfortunately, whether by 

 intention or oversight, he did not adopt the oldest name for it. 



The species was previously represented in our collection by the types of Saunders 

 and Walker from Mysol, Salawatli, and New Guinea. 



73. DiPLOCHORDA MYRMEX. 

 Dipluchorda mijrmex Osteu-Sacken, Ann. Mus. Geneva, xvi. p. 488 (1880). 



1 ? . Mimika Eiver, July 1910. 



This species was previously known only from the type, a female from Katau, New 

 Guinea, which, according to Osten-Sacken's description, differs from the present 

 specimen in having the thoracic stripes interrupted, and has also slightly different 

 head-markings. 



Genus Ortaloptera, gen. nov. 



General habitus similar to Lacus and Biplochorda, but differs considerably from 

 either genus in the chgetotaxy of the thorax and in the venation. 



Head about one-third as broad again as it is long ; eyes a little more than two-thirds 

 as long as the head ; frons parallel-sided, about two-fifths as wide as the whole head ; 

 face a little swollen in the middle below the antennee, below this swelling it is concave ; 

 a pair of sharp outwardly oblique keels a little below the eyes and underneath the 

 antennae. Antennee as long as the face, but being divaricate they do not reach 

 the oral margin ; third joint about four times as long as broad, pointed ; arista 

 with long hairs on the upperside, and also on the a])ical part of the lower side ; the 

 antennae placed about the middle of the length of the head. Bristles*: inner vt 

 strong, parallel; pvt very small, parallel, forwardly directed; oc absent; or 1 + 1, 

 lower pair directed inwards ; genal moderate ; occipital row short, thin, black, 

 pointed. 



Thorax not much longer than broad, slightly narrowed in front ; scutum moderately 

 convex ; scutellum flattened, triangular, with slightly truncate tip. Bristles : scp 

 normal; del rather small and weak; prsc, km, fvst, and fp absent; npl, sa, and 

 mpl normal, strong ; pt and st weak, but distinct ; basal and apical scutellar pairs 

 equally well developed, both divergent. 



Abdomen less than half as long again as the thorax, with six visible dorsal segments ; 

 it is strongly convex, broadest at the apex of the second segment, and much contracted 



* The abbreviations are those adopted by Prof. M. Bezzi in his paper on Indian Trypancids (Mem. Ind. 

 Mus. iii. no. 3, 1913). 



