80 



n. sp. and /. lamiiiatiis n. sp. l'orni a natural group, characteristic by the ninnt)L'r 

 of eyes, structure of antennae, shape of palps and number and arrangement of the 

 tactile hairs; Ideoronciis Mexicanus Bks. seems to be related to these, while /. gra- 

 cilis Bal/, differs from the above mentioned in several respects. Ideobisiiim Balzanii 

 With and /. crassimanum Balz, are very nearly related to each other. 



III. Synopsis of Genera. 



1. , Antennae as long as, and half as broad as the 



quadrate céphalothorax. Galea distally provided 



with four branches Microcreagris Balz. 



1. Antennae shorter than céphalothorax, which is 



more or less elongate, and not half as broad . . . Ideobisium J3alz. 

 2. Eyes present. 



3. Four eyes s. g. Ideobisium Balz. 



3. Two eyes s. g. Idcoroiuus Balz. 



2. Eyes absent s. g. Ideoblotbriis Balz. 



IV. Synopsis of Indian Species. 



1. Tvo eyes. Flagellum consisting of four hairs 



with a few teeth. Palps rather slender with 



four dorsal tactile hairs on hand Ideoroncus Balz. 



2. Abdominal tergites not longitudinally divided. 



Inner margin of the immovable finger of the 



antennae with a large tooth and several smaller 



behind; no lamina exterior present. Maxillae 



not on level with the coxae. Tibia of the first 



pair of legs scarcely longer than the second 



tarsal joint; terminal lateral tarsal hair is 



bifurcate (1) ^- Siaineiisis n. sp. 



2. Abdominal tergites longitudinally divided. 



Inner margin of the immovable finger of the 



antennae with many small teeth; a lamina 



exterior is present. Maxillae on level with the 



coxae. Tibia of the first pair of legs much 



longer than the second tarsal joint; terminal 



lateral tarsal hair is three-branched (2) /. laminatus n. sp. 



1.') No eyes. Flagellum consisting of six, pinnate 



hairs; palps rather clumsy without dorsal 



tactile hairs on hand (3) Ideoblolhriis biped inatiis Dad. 



') A. Tullgren has described a species from Java Ideobisium ntiimtuni ('22(i. p)). 44—15, figs. 4 a-c) 

 easily distinguished from the other hidiaii species by four eyes and iiroad hand without dorsal tactile 

 hairs. 



