THE CANADIAN ENTOMOLOGIST. 215 



longitudinally rugose at the base; tegulae testaceous. Wings 

 hyaline, yellowish; nervures, stigma and hairs on wings pale tes- 

 taceous; the first recurrent nervure joins the second submarginal 

 cell before the end. Legs entirely testaceous-yellow; hind femora 

 not much th'ckened, concave beneath; lobe on hind tibise wider 

 than in T. sladcni. Abdomen has the first segment testaceous 

 blackened in the centre and on either side at the base; second 

 segment testaceous, with a transverse black band not narrowed in 

 the middle; remaining segment black; as in T. sladeni, broad 

 apical bands of shining white hair are noticeable in some lights on 

 segments 3 to 5; abdomen shining, the basal segment impunctate; 

 the dull, closely-punctured area on either side of the 2nd segment 

 near the middle, present in T. sladeni, is absent; beneath, seg- 

 ments 1 to 4 pale; segments 5 and 6 black; segment 5 bilobate 

 (in T. sladeni it is merely emarginate), bearing at its base a 

 transverse row of erect hooked spines, eight in number, equal in 

 length and nearly equidistant 



9 . — Described by Cockerell, Can. Ent., Vol. XLV, p. 36, 

 under the name of T. sladeni. 



Habitat: Khasia Hills, Assam, India. 



Explanation of Figures. 



a. Thrinchostoma sladeni Ckll., cf , 5th ventral segment. 



b. Thrinchostoma assamensis, n. sp., cf , 5th ventral segment. 



THE TYPE OF DELPHAX FABR. AND LIBURNIA STAL. 



BY E. BERGROTH, TURTOLA, FINLAND. 



In his recently published "Contribution Toward a Monograph 

 of the Delphacidie of North and South America," Mr. D. L. Craw- 

 ford discusses the use of the name Delphax by different authors, 

 and correctly states that Delphax crassicornis Fabr. is the type of 

 both Delphax Fabr. and Arceopiis Spin., and that Arceopiis conse- 

 quently is a synonym of Delphax. He then proceeds to say: " In 

 1866 Stal (Hemipt. Africana, Vol. IV, p. 178) further complicated 

 matters by restricting the name Delphax to D. clavicornis, which 

 he erroneously supposed to be the type." In the cited place Stal 

 does not at all speak of Delphax, but in the cited work and volume, 

 p. 175, he expressly states: ''Delphax Fabr., Stal = Arceopiis Spin." 



July, 191.5 



