l30 DE. J. &. DE MAN OiSr THE tODiDPHTHAt/MOTJS 



I am now able to describe two new species of this interesting 

 genus. 



78. DOTILLA BREVITARSIS, n. sp. (PI. IX. figs. 1-3.) 



Pour specimens were collected in the Mergui Archipelago. 

 This new species may be easily distinguished by the following 

 characters : — From Porskal's JD. sulcata, by the surface of the 

 cephalothorax being differently grooved, by the carpopodite of the 

 chelipedes being armed with a small acute spine at its internal 

 angle, by the meropodites of the ambulatory legs being more 

 enlarged, by comparatively much shorter dactylopodites, which 

 are shorter than the propodites, and by many other characters. 

 It differs also from Dotilla myctiroides, M.-Edw., from the coast 

 of Malabar, by the upper surface of the cephalothoras being also 

 sulcate and by the short, not slender chelipedes. D.fenestrata 

 may be distinguished from it at first sight by the remarkable 

 " tympana " which occur on the sternum. 



I will now compare our new species with B. sulcata, two fine 

 specimens of which, collected in the Red Sea, were kindly sent 

 me by the Curators of the Leyden Museum. 



In D. sulcata, Forsk. {conf. Milne-Edwards, Eegne Animal 

 de Cuvier, pi. xviii. fig. 3), the frontal groove is continued back- 

 ward only to the mesogastric region, where a prominence or 

 tubercle is found. Before this prominence it divides into two 

 branches, each of which is immediately again dichotomously 

 divided into two grooves, one of which is directed obliquely 

 forwards towards the external orbital angles, and the other 

 proceeds obliquely backwards towards the bases of the last pair 

 of ambulatory legs. A five-rayed star of grooves is thus formed 

 on the anterior and antero-lateral portions of the cephalothorax, 

 one of the rays of which, the frontal groove, is placed in the 

 middle line of the carapace. The two posterior rays or grooves 

 are longer than the other three, and are accompanied on each 

 side by a supplementary groove ; the external one («) proceeds 

 forwards at a little distance from and parallel to the lateral 

 margin of the carapace, dividing into two short grooves at its 

 anterior end ; the internal one (&) is directed obliquely forwards 

 from the base of the last pair of legs to the urogastric portion 

 of the gastric region. The cardiac and intestinal regions of the 

 cephalothorax, bordered on each side by the oblique groove (5), 



