3 1 6 
Psyche 
[December 
grouping of the species of Omophron, it falls in the first half of 
couplet 1 1 , with axillaris Chaudoir and certain African species. In 
Andrewes’ (1929, pp. 141-143) key to the Omophron of India, 
Burma, etc. it falls between axillaris and rotundatus Chaudoir, but 
differs from both in possessing distinct subocular ridges. It differs 
further from axillaris in having a longer nth elytral stria., less 
coarsely punctate head and pronotum, and more obvious microsculp- 
ture on elytral intervals, and from rotundatus in greater extent of 
the dark color pattern and in finer punctation of head and pronotum. 
The wide extent of the dark color and the fineness of the punctation 
distinguish it also from saigonensis Chaudoir. It is superficially sim- 
ilar to stictus Andrewes (1933) of Tonkin, but stictus has a strongly 
margined clypeus and is relatively coarsely punctate above. The 
Museum of Comparative Zoology possesses, and I have examined, 
specimens of all of these species except saigonensis , which I know 
only from descriptions. 
Tribe siagonini 
Genus Siagona Latreille 
This is the principal or only genus of 'its tribe — whether Luperca 
of Africa and India and Enceladus of South America should be 
included in the same tribe is still an open question. The species of 
Siagona are characteristically shaped, flattened insects which are said 
to live sometimes under stones, sometimes under bark or between 
leaf-sheaths of plants. 
Distribution of the genus. Africa and Madagascar, southern 
Europe, Asia Minor etc., and the Oriental Region. In the latter, 
species are numerous from India to Indo-China, and at least two 
occur southward into the Malay Peninsula, but only one, insulana 
Andrewes (1936) of Java, has been recorded from the islands east 
of Asia. The present new species from Mindoro considerably extends 
the known range of the genus. 
Siagona sinistra sp. nov. (Figs. 3, 4) 
Types. Holotype cf (California Academy of Sciences) and 2 
paratypes ( c? in Museum of Comparative Zoology, Type No. 
31,603; ? in California Academy of Sciences) all from San Jose, 
Mindoro, Philippine Islands, Oct. 1945 (E. S. Ross). The specimens 
were “found in rotting bark of living Buri palm (ESR).” 
Description. Form as figured; black, appendages piceous; above 
rather shining, unevenly and rather sparsely punctate and pubescent, 
mostly without distinct microsculpture; labrum, sides of neck, im- 
