eo 
26 Mr. M‘Lachlan’s Notes on 
strongly illustrative of this tendency to run into local 
forms, and in it (as in many other Calopterygina) the 
radical test of different structure in the anal parts can 
hardly be applied, so we are left with colour and 
markings as the chief guides. Another frequent difficulty 
is that of pairing the sexes, and one that is likely to 
remain, unless local observers make records on the 
spot. 
CORDULIINA. 
Gomphomacromia Batest, Selys. 
I have five males and one female before me. It is 
only in the very adult males that the wings are slightly 
tinged. 
The following are the indications of the hitherto 
undescribed female:—Length of abdomen, 35 mm.; 
length of posterior wing, 35} mm.; expanse, 74 mm. 
Abdomen cylindrical, slightly swollen at the base, not 
dilated at the apex; the ventral margins of segments 
6—8 narrowly yellow; 10th segment very short. Ap- 
pendages conical, pointed, nearly as long as the 9th 
segment. Vulvar scale shorter than the 9th segment, 
broad, divided to the base in its middle by a narrow 
triangular excision. 
G. Batesi was originally discovered by Mr. Bates at 
St. Paulo, on the Upper Amazons. 
N.B.—The four described species of Gomphomacromia 
form a somewhat heterogeneous assemblage, as consti- 
tuting a single genus or subgenus. 
CALOPTERYGINA. 
Lais Devillei, Selys. 
Of this species (described in Compt. Rend. Soe. 
Ent. Belg., xxiii., p. 1, 1880) there are four males 
in the collection. It is probable that three females 
also belong here, but the difficulty in pairing the sexes 
in Lais is not easy when more than one species is 
known from the same locality. It was originally 
described from Baisa (Ecuador); I have it also from 
the Rio Napo (not ‘‘ Pérou oriental?” as indicated by 
de Selys). 
