84: GEO. H. HORN, M. D. 



The second group contains those genera which may be considered 

 central; that is, while they have evident affinities with the surround- 

 ing groups there is no relationship with any of the adjacent tribes. 

 The llypocypti have considerable affinity with the Alajocharini while 

 the Bolitobii and Habroceri lead in different directions toward the 

 Quedii, the first by the margined head: the second by the structure 

 of the posterior coxae which resemble the form seen in Tanygnathus 

 and IletcroOiops very much more than they do any of the genera of 

 the present tribe. 



In all of the books the length of the elytra compared with the 

 body, whether they extend merely to the hind coxaa or are prolonged 

 so as to cover one or two abdominal segments, has been made use of 

 in the separation of the genera allied to BoUtohius from the others. 

 This seems entirely illusory and above all unnatural when genera 

 evidently very closely allied like Hahroceriis and TruhopJu/us are 

 thereby separated even if they are again made to appear adjacent by 

 an adroit manipulation of a table. (See Erichson, p. 28). 



The genera of the groups are as follows : 



HYPOCYPTI. 



Middle coxfe widely separated; mesosternum flat or sliglitly concave in front. 

 Antennae moderately long, with the last three joints forming a loose club. 

 Posterior coxse free, with a small articular plate. Abdomen feebly margined. 

 (Fig. 4) Ilypocyptus. 



Middle coxae narrowly separated; mesosternum carinate iu froat. Antennae 

 short, last three joints rather suddenly broader forming a rather compact 

 club. Posterior coxae free, with a large triangular articular plate conceal- 

 ing the trochanter and the base of the femur. Abdomen feebly margined. 

 (Fig. 3) Anacyptiis. 



Middle coxae contiguous; mesosternum very narrow and deeply depressed be- 

 tween the C0X8B, in front flat. Antennae? Posterior coxae connate with the 

 metasternum the articular plates rounded arising from near the front of the 

 metasternum not covering the trochanter which is broadly oval. Abdomen 

 not margined. Elytra not margined. (Fig. 2) Trichopsciiius. 



These characters really seem to have more than generic value, 

 but the very few genera and the limited observation possible on the 

 unique representative of one of them forbid at present anything 

 more being done. 



TACHYPORI. 



Abdomen margined; tibiae fimbriate at tip with unequal spinules. 

 Mesosternum not carinate. 



Maxillary palj)! filiform TachinilS. 



Maxillary palpi with last joint subulate Tacliyporus. 



