442, Mr. R. McLachlan’s Considerations 
Hab. NortH Borneo (Waterstradt) one $ and 2 (the 
¢ shghtly immature). Coll. McLachlan. 
Distinctly related to 7. plagiata, but can scarcely be 
identical therewith. Taking size and strength combined 
this and 7. plagiata may be considered the largest of 
known recent Odonata, for although some Agrionines (such 
as Megaloprepus cenulatus) somewhat exceed them in 
wing-expanse, they are feeble animals in comparison. 
I proceed to give a synoptical table. 
A. Legs black; the femora dark reddish, except at the apex. 
Sides of the thorax with two broad pale bands. Eighth and ninth 
dorsal segments of the abdomen in the ? endingin a tooth. Neura- 
tion black. The area between the two sectors of the triangle in 
the anterior wings not dilated at the base, and with only a single 
row of cellules (one cellule is indicated as double in each anterior 
wing in the figure of 7. plagiata). A blackish vitta (broad at the 
base) extends from the base to the pterostigma (or further). 
1. In addition to the costal vitta there is a broad dark band on all 
the wings of the 9 between the nodus and the pterostigma 
(or further). Length of posterior wing 79 mm. Length of 
abdomen69mm....... . . 7. PLAGIaTA, Waterhouse 
Hab. Borneo. Type in the collection of Sir Hugh 
Low, not seen by me recently. 
2. There is no band in addition to the costal vitta in either sex, 
Anterior wings with about 34 antenodals and 23 postnodals. 
Length of posterior wing ¢ 75 mm., 2 80mm. Length of 
abdomen 9 70mm... . T. virratTa, McLachl. (vide supra), 
Hab. North BorNeEoO. Types in Coll. McLachlan. 
B. Legs wholly reddish. Ninth dorsal segment only, of the ? 
ending in a sharp tooth. 
1. Sides of the thorax reddish with no evident pale bands. Neura- 
tion reddish. In the wings there is a brown costal vitta extend- 
ing from the base to the pterostigma (or nearly so). The area 
between the two sectors of the triangle in the anterior wings 
not dilated at the base, and with only a single row of cellules 
(this area is not mentioned in the description of 7. degorsi). 
