6 AQUATIC COCKROACHES. 
Annandale has found an,immature specimen in Chota Nagpur, 
India.* It remains only to give a name to the Bornean species, 
which appears to be undescribed. The following description is 
drawn up from an unique female specimen in the Hope Museum, 
Oxford, evidently the adult of some of the larval forms obtained. 
The male is unknown.+ ‘The Japanese species has been wrongly 
referred to the genus Opisthoplatia; there is no doubt that it is 
congeneric with the Bornean species. 
Subfam. EpruamMprRina. 
Genus Rutcnopa, Brunner. 
Rhicnoda natatrix, sp. n. 
?. Castaneous. Allied to R. rugosa, Br., from Burma and 
Java, but larger, and with the dorsal segments less rugose. Head 
concavely depressed between the antennal sockets, this area 
cribrately punctate, rest of head with scattered punctures. Pro- 
notum just covering vertex of head, arcuate, posterior margin 
truncate, anterior and lateral margins slightly reflected; a few 
scattered punctures and a pair of impressions on the disc. Teg- 
mina rufous, exceeding the mesonotum in length. Meso- and 
metanotum and abdominal tergites slightly and irregularly 
rugose, the posterior margins of the sixth and seventh tergites 
plicated. Supra-anal lamina produced, apex emarginate, cerci 
abbreviated, spiracular tubes short; subgenital lamina ample, 
posterior margin sinuate, disc transversely wrinkled. Front 
femora with five spines in middle of anterior margin beneath, 
four spines on posterior margin ; formula of apical spines 7, 4, 4, 
front femora with no genicular spine. Posterior metatarsus 
equals remaining joints. Total length, 35°5 mm.; length of 
tegmina, 7 mm.; pronotum, 10 mm. x 17°5 mm. 
Borneo (Wilson Saunders collection, Hope Museum, Oxford). 
* Jour. As. Soc. Bengal (new series), vol. 11. 1906, pp. 105, 106. Dr. 
Annandale confirms my account of the respiration of these insects, and noted 
the ease with which his specimen was drowned when totally submerged. 
+ In a preliminary account of these Cockroaches (Rep. Brit. Assoc. 1901, 
p. 689) I stated that they consisted of two species—one an Epilamprine, the 
other a Panesthiine. ‘This is an error due to inaccurate information supplied 
to me at a time when my knowledge of the Blattide was less than it is now. 
All the specimens collected by me are immature, and are referable to two 
Epilamprine genera, Rhicnoda and Epilampra. The females of the former 
genus apparently lead a semi-aquatic life always. I expect that it will be 
found eventually that some terrestrial species of Epilampra are amphibious 
or aquatic in their earlier stages. 
