132 TERRESTRIAL FAMILIES OF IIEMIPTERA-HETEROPTERA 



9^Seveiith abdominal teryitc with a wide, deep semicircular emaryination in its posterior 

 border, seventh stemite cleft throughout. Eighth tcrgite with posterior margin sharply 

 emarginate in the extreme centre. Gonapophyses unarmed (Plate IX, fig. 4). 



Length 6 (liolotypc) 4.13 mm., l)readth 2.05 mm. 



Length 2 (allotype) 4.55 mm., Ineadth 2.15 mm. 



Indian Tibet. 2 S S (holotype and parol ypc), 5 5 9 (allotype and paratypcs). 

 L63, l)etween Nying-ri and Chungang La, altitude 5100-5300 m. (16,800-17,400 ft.), under 

 and between sparsely distributed j)lants of Artemisia minor J^icq., in company with Tibct- 

 ocoris margaretae gen. n., sp. n., and Psyllids, on which furm.s it probably feeds, 18-19 July, 

 1932. The male i)aratype was taken on a slope just above the summit of the Chungang La, 

 altitude 17,397 ft., on the boundary between Indian Tibet and Tibet proper. 



In spite of its unarmoured femora and straight abdominal sternal sutures this remark- 

 able insect is referred to the .\phanine tribe Gonionotaria on account of the disposition of 

 the bristles on its head and antennae, and the position of the abdominal spiracles. Doluiacoris 

 is clearly allied to Dioinphalus Lieb., which also has straight abdominal sternal sutures, very 

 similar brachypterous elytra, no conspicuous tarsal aroliae (Fieljer, 1864, T. 1., iig. ]\^ f.) 

 and a small spur on the anterior coxa. The structure of the rostrum, which in Diomphalus 

 reaches to beyond the middle of the mesosternum, with a basal joint reaching almost to the 

 base of the head, constitutes the most striking generic character of Ihiliiiacoris. The short 

 antennae and trapezoidal pronotum suggest comparison rather with the little known 'i'rans- 

 baikalian Dioinphalus anmilicornis Jak., than with 1). hispidulus I'ieb., but Jakovleff (1889) 

 makes no mention of his species differing from hispidulus in the structure of its rostrum so 

 that it is presumably correctly placed in Dioinphahis. Doluiacoris ajipears to have larger 

 eyes than either species of Dioiuphalus and in the latter genus the anterior femora appear to 

 bear spurs; the shape of the pronotal bosses prol)ai)ly furnishes a further generic character. 



In the cour.se of examining DoluMcoris it became apparent that no adequate informa- 

 tion was available as to the position of the abdominal spiracles in the \arious tribes of the 

 .Iphauiuae as well as in certain of the other subfamilies of the Lygaeidae. Mr. \V. E. China 

 most kindly offered to make ])reparations from representative species of each tribe of the 

 Aphauiuac, using as far as possible the typical genera and also of representatives of a numl)er 

 of other subfamilies. The results of these studies Mr. China most generously asked me to 

 incorporate in the present paper (Table II). A few words may therefore be appropriately 

 devoted to the problems of the classification of the Lygaeidae raised by these data. Omitting 

 the Aphaninae it is clear that while there is a general progression from a dorsal to a ventral 

 position when the subfamilies are considered in the order currently used in systematic works, 

 3'et this [jrogression is not as regular as would appear from the keys that have been published, 

 as, for instance, those given by Stal (1872) or in the excellent work of Barbour (1917, 

 1918). The following points require comment: 



1. The Lyga-einae and Cyminae are generally stated to have entirely dorsal spiracles; 

 this appears to be essentially correct, though the spiracles on the seventh segment of Cvuius 

 are almost lateral, being situated dorsally on the conjunctival membrane between the con- 

 nexivum and the sternite. 



2. The Hcnestarinae are omitted from Barbour's key as the subfamily is unrepre- 

 sented in the Nearctic Region. If it is to he included with the Blissiuac and Geocorinac, as 

 is done by Stal (1872), the key character defining this group of subfamilies must be emended 



