1919.] S.Kemp: Notes on Crustacea Decapoda. 311 



a. Antero-lateral portions of carapace much in- 

 flated and separated by an abrupt declivity 

 from outer orbital angles ; 4th segment of male 

 abdomen anteriorly emarginate, not constricted, 

 5th longitudinally channelled ; abdomen of 



female with convex lateral margins .S". iuvesttgaforis. 



b. Antero-lateral portions of carapace not greatly 

 inflated, sloping gently to outer orbital angles ; 

 4th segment of male abdomen much constricted 

 anteriorly, 5th not channelled ; abdomen of 



female with concave lateral margins S. pro.\i)iia. 



II. Ischium of third maxillipeds shorter than merus. [Chela 

 with strong carina or row of granules near inferior 

 border.] 

 .4. Ischium and merus of outer maxilliped studded with 



coarse tubercles. [Merus about twice as long as 



ischium ; carpus of male cheliped without tooth at inner 



angle.] ... ... • ... -V. koclii. 



B. Ischium and inerus of outer maxilliped smooth, or 



nearly so. 



1. L'pper surface of carapace sculptured ; merus of 

 third maxilliped three times as long as ischium ; 



carpus of male cheliped ?... ... ... S. sigifloriim. 



2. Upper surface of carapace without e\idt_Mit sculp- 

 ture ; merus, of third maxilliped only a little 

 longer than ischium ; carpus of male cheliped 



with a tooth at inner angle .. . . .S". i>iffata. 



The species fall into four groups. Firstly the very highly 

 specialized 5. crabncauda which differs widely in the form of the 

 male abdomen from any other species of the genus. Secondly 

 5. glohosa and 5. pitula which are normal forms. Thirdly 5. 

 investigatoris and 5. proxima, allied to the foregoing but distin- 

 guished by the presence of a ridge. which bisects the tympana on 

 the walking legs, and fourthly 5. kochi, S. sigillorwn and 5. inflata 

 which, though true Scopimeras, show affinity with Dotilla in the 

 proportions of the merus and ischium of the third maxillipeds and 

 in the presence of a certain amount of sculpture on the lateral walls 

 of the carapace. 



The brush of hairs between the bases of the first and second 

 walking legs is very conspicuous in all the species of the genus 

 that I have seen. A similar character is sometimes found in 

 Tympanoijierus , but occurs between the bases of other legs as well 

 and is always much less easily detected. 



S. crahricauda, S. pilula, S. investigatoris and S. proxima are 

 Indian species. 



Scopimera crabricauda, Alcock. 



1900. Scopimera crabficaiida. Alcock, Jouvn. Asiat. Soc .Hciigal LXIX, 

 p. 370, and Illusfr. Zool . R.I.MS. ' Investigator,' Crust , pi. Ixiii, 

 figs. 5, Sfl, 56. 



In addition to the particulars given by Alcock it may be noted 

 that in both sexes on the inner face of the chela there is a large 

 blunt ridge, dorsally convex, extending from the base of the fixed 

 finger to the carpal articulation. There are three finely serrate 

 carinae on the fixed finger; the outer and inner reach only a short 



