Western China and Eastern Thibet. 373 



yellow spot behind each eye. Protliorax with a yellow line 

 on each side (continuous with the humeral lines). Tliorax 

 with a slightly curved, ratlier broad, humeral yellow line; sides 

 and pectus yellow, divided by a nearly straight black line, 

 broadest anteriorly. Legs black ; coxaj and trochanters 

 spotted with yellow. Abdomen clothed with rather long 

 black hairs at its base, somewhat shining ; first segment 

 broadly yellow at sides, second with two yellow lateral lines, 

 third and fourth with one yellow lateral line (not reaching the 

 apex on the fourth), and with a yellow lateral basal spot; 

 ninth and tenth segments probably sometimes pulverulent 

 above, tenth broadly produced into a triangle on its posterior 

 margin, deeply cleft in its middle, yellow on its sides. Su- 

 perior appendages longer than the tenth segment, subcylin- 

 drical, gradually forcipate, the incurved apices acute, not 

 toothed ; inferior appendages indicated by a brown swollen 

 base, divided by a line in its middle, filling in the wide 

 excision in the tenth ventral segment. 



Wings vitreous, slightly tinged with smoky yellowish ; 

 pterostigma (3 millim.) dark reddish brown, between strong 

 black nervures ; neuration black; 21 postnodal nervules in 

 the anterior wings, 20 in the posterior. 



? as in the male, but the labrum and the spots on 

 the front are livid or brownish and the spot behind the eyes is 

 absent or obsolete. Abdomen more shining ; a single yellow 

 lateral line on the second segment, continued on the third and 

 fourth, and an apical yellow lateral spot on the third to seventh; 

 ninth with a very large yellow lateral spot, and the tenth 

 largely yellowish on the sides. Appendages as long as the 

 tenth, slightly curved laterally, acuminate, pointed, yellowish 

 at the base ; viewed in front there is a large swollen yellow 

 sulcate mass between their base ; appendages of vulvar 

 lamina cylindrical, black, strongly curved. 



Wings scarcely tinged ; pterostigma (slightly immature) 

 whitish yellow; neuration brownish in certain lights; 21 

 postnodal nervules in anterior wings, 19 in posterior. 



Length of abdomen, (^ 33, $ 35 millim. ; length of poste- 

 rior wing, c? 30, ? 34 millim. 



Moupin, one male ; Siao-Lou, one female. 



Pyrrhosoma tinctipenne, M'Lach. 



ErytJiroimna tinctipennis, M'Lach. Ann. & Mag. Nat. Hist. ser. 6, 

 vol. xiii. (May 1894) p. 436. 



The discovery of the male renders it certain that this insect 

 is a Pyrrhosoma rather than an Erythromma (the two genera 



