88 



prove to be of but little importance when large series of specimens have 

 been examined. Mr. C. Hose has also recently sent to the museum 

 from Mt. Dulit in Borneo, a second specimen which in part bridges 

 over the interval between the two species here under discussion. This 

 specimen is 52 mm. long, has 21 pectinal teeth, and four keels on the 

 last abdominal sternite — thus agreeing with hosei. But in colouring 

 it comes somewhat between the two, although differing a little from 

 both; for the vesicle, hands and fingers are yellow, the Angers being 

 only very slightly darker than the hand. In other respects, however, 

 the colouring is that of hosei, except that the tarsi are yellower. 



(Isometrus s. s.) 



3. Isometrus maculatus (De Geer). 



Specimens of this wide-spread species were obtained at Buitenzorg. 



4. Isometrus formosus sp. n. (PL VI, fig. 3— 3c). 



Java: Buitenzorg. 15 specimens, all of which appear to be females. 



Colour ochraceo-fuscous or flavo-fuscous above, paler beneath; cépha- 

 lothorax with the area around and in front of the central eyes entirely 

 fuscous, the rest of it ochraceo-fuscous, with a clearer ochraceous spot 

 on the posterior angle on each side; tergites, except the last, marked 

 posteriorly on each side with two, one lateral and one median, clearer 

 ochraceous marginal spots, and a < shaped ochraceous patch, the ex- 

 ternal margin of each fulvous and bounded internally by a fuscous band 

 the last tergite fusco-lineate ; lower surface of the trunk entirely pale 

 except for two feeble fuscous spots on the posterior half of the 5 th ster- 

 nite ; tail with the first three segments above anteriorly ochraceous and 

 posteriorly fuscous, spotted and lined with fuscous beneath, the fourth 

 and fifth segments and vesicle rufo-fuscous in front passing imperceptibly 

 into fuscous behind; humerus marked above with two fuscous bands, 

 pale beneath, brachium almost entirely fuscous above, its proximal 

 extremity only flavous, fuscescent beneath; manus fia vous, fusco- 

 maculate and lineate externally, digits with the distal half fuscous and 

 the proximal rufo-fuscous; legs externally banded with fuscous. 



Céphalothorax closely and somewhat coarsely granular throughout; 

 the anterior border widely emarginate; ocular tubercle widely sulcate 

 and finely granular. 



