708 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



TRITHEMIS AURORA Burmeister? 

 Plate XLI, fig8. 6, 7. 



More than eight}" specimens, some in vevv bad condition; many 

 apparently well grown : Buitenzorg, Java, D. G. Fairchild. 



Length, 16 mm.; abdomen, 10 mm.; hind fennir, 4,5 mm.; width of 

 head, 5.. 5 nun.; of abdomen, 6 mm. 



A short, stocky nymph, with flat head and abruptly pointed abdo- 

 men. Head strong!}^ flattened anteriorly and strongly sloping to the 

 front, with hind margin nearly straight, sides sloping outward to the 

 eyes, which are rather large and directed antero-laterall}'. Antennae 

 seven-jointed pale ))e3'ond the second segment. Labium broad, its 

 hinge reaching the middle of the mesothorax; median lolie prominent, 

 obtuse at apex, its sides straight, thinly spinulose; mental seta^ about 

 14, weak, in an indistinct series, the fifth to seventh each side longest; 

 lateral seta^ 10, in length equaling the very slender hook; teeth on 

 opposed edges obsolete of lateral lobes, but single spinules remain to 

 mark their position. 



Legs rather short, hind tibia^ showing a series of fine spinules. 

 Wing cases reaching the middle of the seventh abdominal segment. 



Abdomen stout, little depressed, rounded dorsally, without dorsal 

 hooks. Lateral spines on segments S and 9, short, stout, one-third as 

 long as their respective segments, spinulose on their external margins. 

 Tenth segment less than half as long on the middorsal as on the mid- 

 ventral line, more or less included in the apex of the ninth segment. 

 Appendages as long as the ninth segment on its ventral side; laterals 

 one-half as long as the others, divaricately curved at tips. Some 

 nymphs show paler markings on ocellar tul^ercle, and on apical and 

 lateral margins of abdominal segments. Legs pale, with indistinct 

 darker bands on femora. 



This is certainly a Trlthemu^ and one of the more typical group of 

 species; if not the one named above, then, at least, some closely allied 

 species. 



DIPLACODES TRIVIALIS Rambur. 

 Plate XLI, figs. 8, 9. 



More than a hundred specimens, many in bad condition, and some 

 possibly not the same species, but not sufficiently distinct in their 

 present state for separation. Some apparently grown. Also a num- 

 ber of imagos, collected at the same time and place: Buitenzorg, Java, 

 D. G. Fairchild. 



Length, 11.5 mm.; abdomen, 6 mm.; hindfenmr, 8.5 mm.; width of 

 head, 4 mm.; of abdomen, 4.5 mm. 



Similar to the preceding species, l)ut much smaller, with head less 

 flattened in front and eyes more prominent laterally. Median lobe 



