1904 ] NATURAL SCIENCES OF PHILADELPHIA. 89 



Subfamily HETEROPTERYGIN.E {Cladomorphime Brunner). 



Genus HETEROPTERYX Gray. 



1835. Heteropterijx Gray, Synopsis Spec. Ins. Phasm., pp. 13 and 32. 



Type. — Phasma dilatatum Parkinson. 



Heteropteryx dilatata (Parkinson). 



1798. Phasma dilatatum Parkinson, Trans. Linn. Soc. London, IV, p. 190, 

 tab. IS. [Asia.] 



Two specimens, male and female; Trong, Lower Siam. (Dr. W. L. 

 Abbott.) [U. S. N. M.] 



The male of this species has never been described, and appears 

 to be remarkable for the great length of the tegmina and wings. 

 It resembles the male of mulleri Haan closer than any other species the 

 male of which is known. From mulleri it can readily be distinguished 

 by the shorter mesonotum, the longer tegmina (55 mm.) and wings 

 (70 mm.), and the more ample lateral flaps of the seventh and eighth 

 abdominal segments. 



The range of the genus Heteropteryx covers Malacca and Trong (dila- 

 tata, castelnaudii, rollandi), Sumatra (mulleri), Java (rosenbergi) , 

 Borneo (grayii, dehaanii and dilatata), Celebes (westwoodii) and Aus- 

 tralia (austrcdis). 



Genus DATAMES StM. 

 1875. Datames Stal, Recensio Orthopterorum, III, pp. 51 and 93. 



Type. — Acanthoderus oileus West wood. 

 Datames sequalis ^ n. sp. 



Type. — ? ; Island of Obi, Moluccas. [A. N. S. Phila., presented by 

 Mr. Morgan Hebard.] 



Closely allied to D. mouhotii Bates^^ from Cambodia, but differing in 

 the peculiar form of the ninth dorsal abdominal segment, and the almost 

 entire absence of oblique ridges on the abdominal segments. The 

 Javan and Malaccan oileus West wood, rather curiously, is not at all 

 closely allied. 



Size small; form elongate, tectatc, sul^equal; surface obscurely 

 tuberculate. Head subequal in width, slightly longitudinal; occiput 

 elevated and bearing two converging cristate crenulate ridges, which, 

 when united posteriorly, form a jagged projecting lobe; interocular 

 region with a structure somewhat similar to that found on the occiput, 

 but on a smaller scale, the ridges not meeting posteriorly and being 

 trituberculate, the anterior tubercle developed into a distinct curved 



^* In allusion to the uniform breadth of the thoracic and abdominal segments. 

 ^^ Trans. Linn. Soc. London, XXV, p. 342. 



