64 



but the fusioD of the tergites of the Oneopodidae, although this 

 faniily belongs to the Laniatores, is entirely different. On the 

 other hand it cannot be denied that Nemastoma and Sclerosoma, 

 although really Palpatoreg, show a great affinity with the Insi- 

 diatores in the matter of segmentation, as all the anterior tergites 

 develop into a scutum while the posterior four reinain unfused. 

 It therefore does not seem to be reasonable to attach decisive 

 systematic importance to the segmentation of the opisthosoma. 



2. At the first glance the sternal parts of the body look more 

 like those of the Laniatores than those of the Palpatores. But 

 when, instead of comparing only the direction in which the stern urn 

 runs, its peculiar form is also compared — which I deern more 

 important — it becomes obvious how much the sternum, con- 

 tinuously widening out towards the posterior part (which can 

 very well be compared to that of Nemastoma and Trogulus) differs 

 from the liuear form of that of the Lauiatores. 



The third maxilla, au appendage of the coxa of the second 

 pair of ambulatory legs, is distiuct and movable in the Phalangiidae 

 and Ischyropsalidae (thus in the Apagosterni Pocock) ; on the other 

 hand it does not exist in the Eupagosterni Pocock. With the 

 Laniatores this organ is sometimes prominent, in other instances 

 very little developed, but always of a piece with the coxa. In 

 the Insidiatores I found it fairly large, rather lowly triangular, and 

 with a broad base fused with its coxa. 



3. The palpi of Insidiatores are of a very original structure. 

 Their short, often monstrously big joints are always armed with 

 characteristic thorns : heavy, strong cones, provided with hairs 

 growing sideways unter the top. Bj means of these palpi alone one 

 would at once recognize the sub-order. 



4. Each of the short legs is armed with only one large terminal 

 claw ; that of the posterior two pairs has moreover a much 

 smaller side-claw on both sides. The history of the development 

 of the claws in the three sub-orders, too, tells us of the existence 

 of fundamental differences, which ho wever are difficult to explain 

 without illustrations. 



