JAMES A. G. REHN 219 



species, it is difficult to judge what are and what are not criteria 

 of specific value. Both of our specimens are without apparent 

 wing scales, these being present in the type of scudderi, but we 

 know other species of the genus vary in this respect. The teg- 

 mina are shorter in proportion than Bormans describes, but this 

 also we know is intra-specifically variable in the genus. The 

 antennae have the distal pale annulus as described but the proxi- 

 mal joints are not pale. When compared with the closely re- 

 lated P. burri Borelli", from Paraguay, our material differs in the 

 more longitudinal pronotum, in the tegmina having the distal 

 margin slightly obhque truncate toward the disto-costal angle 

 instead of the disto-sutural angle, in the form of the anal segment 

 and forceps and in the color of the limbs; agreeing, however, in 

 the absence of wing scales and in the form of the lateral portion of 

 the abdominal segments. As scudderi was based on the female 

 sex and burri on the male, the last mentioned difference is prob- 

 ably sexual. 



Psalis species 



Porto Velho, Rio Madeira. (Mann and Baker.) One 

 female. 



Labidura riparia (Pallas) 



1773. Forficula riparia Pallas, Reise Russ. Reichs, pt. ii, p. 727. [Shores of 

 Irtysch River, western Siberia.] 



Para, Para. (Mann.) One male. 



Abuna, Bolivia. (Mann and Baker.) One male. 

 We have not attempted to allocate these specimens in the 

 present species complex, as that seems unwarranted in the 

 present state of our knowledge. Both individuals have the 

 caudal margin of the anal segment bidentate, the teeth larger and 

 closer together in the Para specimen than in the Abuna one. 



Labiidae 

 Spongovostox alter (Burr) 

 1912. Spongovostox alter Burr, Ann. K. -K. Naturhist. Hofmus. Wien, xxvi, 



p. 336, fig. 13. [Mapiri, Bolivia (type locality); Minas Geraes, Brazil; 



Bugaba, Panama.] 



Porto Velho, Rio Madeira. (Mann and Baker.) One male. 

 Abuna, Bolivia. (Mann and Baker.) One male. 

 6 Boll. Mus. Zool. Anat. Comp. Torino, xx, no. .51t'). p. 2. fig., (1905). 



TRANS. AM. ENT. SOC, XLII. 



