246 SERIES II. CLAV1CORNIA. 



v. Last joint of tarsi, long, claws large; head retractile, the month pro- 

 tected by the prostermun : aquatic or subaquatic species. 



Family XXXIII. PARNIU.-E, p. r>7.~>. 



ss. Last joint of tarsi moderate, claws normal; thorax (in our species) 

 with deep grooves; month parts covered by a large mentum. 



Family XX. KIIYSSOUIII.K. p. "MX. 



Subseries C. TUTU A MKUA CLAVK'ORNIA. 



In this group (with the exception mentioned in key to subseries), 

 the tarsi are four-jointed. The species live, for the most part, in 

 fungi, especially those growing on dead trees and logs; some are 

 subaquatic, living in mud or sand along the margin of water. 



KEY TO FAMILIES OF TETRAMERA CLAVICORNIA. 



(i. Ventral segments all free and movable. 



1>. Wings fringed with hairs; very small, less than 2 mm. 



c. Hind coxie contiguous, with plates covering the thighs; antenna' 

 nine-jointed, club two-jointed. 



Tribe (VIII ). Cliniilihii, p. L.MH. 



cc. Hind coxa* separate, without plates; tarsi apparently three-jointed, 

 the basal joint concealed by (he u itched second joint; mandibles 

 with comb-like teeth. Family XV. (.'ORYLOIMIID.K. p. filll. 



1>1>. Wings not fringed with hairs. 



<7. Front coxa* transverse; body contractile; length less than 1' mm. 



Tribe (XXVI). 1'iilKj<-<'i>1i<iliiii. p. (147. 

 <1<1. Front coxa? not transverse. 

 c. Front coxa? globose. 



/'. Tarsi slender; length less than 4 mm. 



Subfamily (XVII). Miircttrhur. p. .">.">4. 



/'/'. Tarsi more or less dilated and spongy beneath, the fourth joint 

 united with the fifth, so that only four are visible; antenna' 

 strongly clubbed. Family XVIII. KROTYMIU:. p. .">:;!>. 



cc. Front cox;e oval. 



(I. Front coxa? well separated by t-he horn-like prosternuin. 



}i. Form oval, depressed; head free; surface finely and densely 

 punctured and hairy; length less than G mm. 



Family XXIII. MYCETOPHAOTD.K, p. ."Vsi!. 



////. Form cylindrical; thorax prolonged over the head; length 



less than 8.5 mm. Family (XLVII). CioirvE. p. X'.tri. 



</!(. Front coxa? almost contiguous; prosternuin semimembranous ; 



form small, rounded, convex: habits subaquatic; length less 



than 1 mm. Family XXXII. CiEiiRYSSiDJE, p. <>7.~>. 



mi. Ventral segments 1-4 firmly united, the fifth only being movable. 



L Antenna? of regular form; tibia- not dilated, not tit ted for digging; 

 front and middle coxa- small, globose; length less than (i mm. 



Family XIX. COLYDIID.-E, p. fi4J). 



U. Antenna 1 short, the outer seven joints broad and short; tibia? dilated, 

 armed with rows of spines and lilted for digging; lahrum and 

 mandibles projecting forward; length less than 7 mm. 



Family XXXIX'. HKTKROCEIMD.K, p. 'si'. 



