BHYPAEOCHEOMARIA. 59 



This is the largest division of the Aphaniiiae and is universally 

 distributed, though the majority of the known genera and species 

 belong to the Paleearctic Region — a fact, however, which probably 

 only represents the greater aetivit}^ of collectors in that region. 



To arrange the liht/parochroiiiaria generically is a work of no 

 little difficulty. The species are not only small, but frequently 

 received in a mounted or carded condition, which renders the 

 examination of some characters practically impossible. Those, 

 however, relied upon in the following s^ynopsis should make the 

 discrimination of the British Indian genera a work requiring little 

 trouble, and it must be remembered that we are now dealing 

 exclusively with this fauna. 



Si/nojJsis of Genera. 



A. Head distinctly exserted ; eyes inserted at 



some distance from anterior margin of 



pronotum Pkimieeus, p. 60. 



B. Head not exserted, immersed to about the 



eyes. _ 



a. Head including eyes mucli more than lialf the 



width of pronotum at base. 



a. Pronotum transversely constricted. 

 a'. Pronotum constricted near middle. 



a'-. Corium angulated on apical margin ; 



antenuse not clavate Rhodiginus, p. G2. 



li-. Covium with apical margins straight ; 

 antennae with third and fouvth 



joints clavate Appolonius, p. 62. 



b'. Pronotum constricted nearer posterior [p. 63. 



than anterior margin Prostemmidea, 



b. Pronotum not transversely constricted. 



a'. Eyes touching anterior margin of pro- 

 notum BuD^us, p. 76. 



b'. Eyes well separated from anterior mar- 

 gin of pronotum Critobultjs, p. 77. 



b. Head including eyes not half width of pro- 



notum at base or not much more than half. 



a. Pronotum considerably or distinctly longer 



than half the width at base. 



a'. Pronotum about as long as broad ; head 



narrower than anterior margin of 



pronotum Polycrates, p. 64. 



b'. Pronotum not so long as broad. 



a". Head much narrower than anterior 



margin of pronotum Bosbhquius, p. 64. 



b'. Head with eyes as wide, or scarcely 

 as wide, as anterior margin of pro- 

 notum. 

 ct^. Fourth joint of antennae as long 

 as second or longer. 

 a^. Second and third joints of ros- [p. 68. 



trum subequal in length Lachnophorus, 



i'. Second joint of rostrum a little 



longer than third Lamprodema, p. 71. 



