246 SERIES II. CLAVICORNIA. 



s. Last joint of tarsi, long, claws lavi,'e ; head retractile, the month pro- 

 tected by the presternum ; aquatic or subaquatic species. 



Family XXXIII. 1'ahmd^, p. <i75. 

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

 with deep grocives; mouth parts covered by a large mentum. 



Family XX. Rhyssowd-E. p. r,."i,s. 



Subseries C. TETRAMEKA CLAYICORXIA. 



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

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

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

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



KEY TO EAillLIES OF TETRAMEKA CEAVICORiMA. 



(I. Ventral segments all tree and movable. 



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



c. Hind cox.-c contiguous, with plates c<jvering the thighs; antenna' 



nine-jointed, club two-jointed. 



Tribe (VIII). Chiiiihiiii, p. 2!t1. 



rr. Hind cox.-e separate, without i)l:ites ; tarsi aiiparently thi-ee-jointed, 



tlio basal joint concealed liy the mtched second joint; mandibles 



with comb-like teeth. Family X\'. Cokylophid.e. p. ."lOl. 



li&. Wings not fringed with hairs. 



d. Front coxas transverse ; body contractile : length less than 2 mm. 



Tribe (XXVI I. Cijhocepluiliiii. p. fi-lT. 

 dd. Front coxre not transverse. 

 r. Front coxre globose. 



f. Tarsi slender ; length less than 4 mm. 



Sulifamily (X\'II). iliicctwiiur. p. :<?A. 



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



united with the fifth, so that only four ai'e visible; antennre 



strongly clubbed. Family XA'III. Ekotylih.e, p. ."I'^.'.i. 



ec. Front coxa' oval. 



g. Front coxfE well separated by the horn-like presternum. 



7(. Form oval, depressed; head free; surface finely and densely 

 pimctured and hairy; length less than (i mm. 



Family XXIII. llY-CETorHAGin.K. ii. r>x2. 



Ml. Fonn cylindrical; thorax prolonged over the head; length 



less than .'i.."! mm. Family (XLVII). Cioid.e. p. S'.ri. 



Off. Front coxffi almost contiguous ; prosternum semimembranous ; 



form Small, rounded, convex; habits subaquatic; length less 



than 1 mm. Family XXXII. (jEORvssin.E, p. ('>T."i. 



aa. Ventral segments ^~i firmly uuited. the fifth only being movable. 



?. AntemijE of regular form; tibise not dilated, not fitted for digging; 

 front and middle coxre small, globose; length less than mm. 



Family XIX, ('oLvmiDiE, p. ."iID. 

 a. Antenna? short, the outer seven joints broad and short; tibire dilated, 

 armed with rows dt spines and fitted for digging; labrum and 

 mandibles iir(ijectin.g forward; length less than 7 mm. 



Family XX.\I\'. IlETKUocF.uin.T;. ji. (1S2. 



