28 



lluiii ill Ubishiiu C. K.; llieir liiiiilation inwards I could not Ibliow. Tlic rounded 

 lamina inferior is excessively small (fig. 4c-d, //). The ventral surface of the 

 maxillae bears below a few hairs in addition lo the terminal ones. 



Corresponding lo the single inner marginal fissure of Ohisiiim miiscornm Leach, 

 a very remarkable one is found in a similar position (PI. I, fig. 4 e, ()• This fissure 

 is so strongly curved, that its two pointed tips, which are directed forwards and 

 outwards almost touch each other; the oval-shaped area, limited by the fissure, is 

 thinly-skinned. The median fissure (figs. 4 e, ;n— 4 f ) is even more peculiar than 

 the corresponding one in Obisium C. K. ; the organ of the lefl side (4 e) consists of 

 an inner almost circular, broad fissure; the two outer ones are slraighler, only 

 including a portion of the inner one; of these two the most exterior is both shorter 

 and narrower than the median. The inner fissure of the corresponding organ of 

 the right side is less curved and inwards bifurcated ; its exterior fissures are shorter, 

 especially the third one (fig. 4 f ). Between the two organs four very narrow lines 

 are visible, apparently placed beneath the skin; their axis is perpendicular on the 

 line between the two lyriform organs. Near the outmost anterior margin we find 

 as usual four oblique fissures, of which the inmost one is the longest (fig. 4d, f"^). 

 Above in the middle four longitudinal fissures are found, of which the inner is 

 the longest and placed apart from the three others (fig. 4c, /'). Both the labrum 

 and tlie laminae maxillares are more elongated in Ideoronciis laminatus n. sp. than 

 in /. Sicimensis n. sp. Their more detailed structure I could not investigate with 

 the scanty material at my disposal (fig. 5 b); the median circular organ is present, 

 but placed more laterally than in /. Siamensis n. sp. 



IV. Garypus irrugatus Sim. (PI. I, (igs. 6a-d). 



The labrum appears most similar to that of Chelifer Geof. ; the foremost free 

 portion is rounded and narrow, while the hindmost is broader; the labrum does 

 not project behind the maxillae as in the Hemictenodactyli and is laterally covered 

 by the overlapping maxillae as in Chelifer Geof. (PI. I, fig. 6 a). The arrangement 

 of the cliitinous ridges at the surface of the labrum as well as of the paired bodies 

 above its hindmost broad portion (fig. 6 a, h) bear some similarity to that in the 

 latter genus. Beneath the hindmost portion of the labrum and over the sucking 

 organ a broad cliitinous body is found (PI. I, fig. 6 a, p). The maxillae, which are 

 granular with scale-shaped granules along the sides, are pointed and provided with 

 a well developed lamina maxillaris superior, but with a very narrow lamina inferior 

 (fig. 6 a-b, Is-li). The ventral surface bears many short hairs along the inner side; 

 at the outer corner a long pointed one is situated. Just where the maxilla is bent 

 inwards to establish the very narrow manducatory ])art , a short very strongly 

 curved hair is found (fig. 6d, /i); a similar one is placed near lo the tip. 



The marginal interior fissure (PI. I, figs. 6 b, /'^ — 6(1,/) is placed much more 

 in front than usual, is excessively broad and includes a thinly-skinned depressed 



