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times curled forward, a "post-antennal chamber." The short- 

 ness of the pronotum is oftimes more apparent than real, on ac- 

 count of the median portion standing nearly perpendicular, being 

 bent in the middle and fitted into the emargination of the vertex. 

 The absence or presence of carinae on pronotum or scutellum 

 is a very uncertain character, as many small light-colored species 

 appear to have carinae on account of the three dark longitudinal 

 marks, indicating the attachment of the thoracic muscles. 



For specific distinction it is necessary to compare the genital 

 armature in certain groups. The present study shows that very 

 few species have a wide distribution among the Malay Islands, 

 but certain of the species are difficult to separate except by the 

 genitalia. 



The family can be divided into four groups : 



1. Tegmina exceptionally long and narrow, wings less than half 



the length of tegmina, sometimes very minute. .Group III 



Tegmina not long and narrow, wings more than half the 



length of tegmina 2 



2. Cubital veins not reaching to hind margin of tegmen, but 



ending in the extended claval vein ; third claval cell open, 

 extending along hind margin to last apical median cell .... 



Grou]) II 



Cubital veins ending in hind margin of tegmen, third claval 

 cell closed, not extending to last apical median cell 3 



3. Cubitus simple or furcate, not running into first median 



sector Group I 



Cubitus with three or more branches ( or the cubitus con- 

 nected with the first median sector, forming an angular 

 or diamond-shape cell) Group IV 



The first, or Ccnchrca, group is a natural one, and the forms 

 included in it are closely allied ; in many of the genera the sys- 

 tems of neuration are all separated from the base of the tegmina, 

 such forms being the most generalized of the Dcrhidac. Phaci- 

 occphaliis niilfodias and P. piilhitits are of interest as showing 

 the commencement of the modification which distinguishes group 

 two, namely, the opening of the third claval cell and the failure 

 of the cubital veins to directlv reach the posterior margin. (PI. 

 I f. 22, PI. Ill f. 16.) 



The second, or Otioccnis, group is also a homogeneous one 

 and follows naturally after group one ; it contains some of the 

 most fantistically shaped insects of the familv, such as S2i'c::c\ia 



