82 GEO. n. HORN, M. D. 



in Erchomns and Anacyptnx. Marfjined at the sides and with dis- 

 tinct epipleurfe, except in Trichopsetiius. 



Abdomen margined in all the genera except Conosomn and Truhop- 

 senius and very feebly in Anaci/pfus. 



MKSOSTEaNUM qot carinate in most genera, carinate in Ci/ea, 

 Ph^aetoporus. Erchomus, Coiioxoma and i'eeh\y m A))nn/pfm ; flat or 

 feebly concave in Hijpocyptnn ; the coxae rather widely distant Hypo- 

 ci/p/ti^, (fig. 4), contiguous in Hdhroccrua and Trichnpseni'ns^ (fig. 2), 

 and very narrowly separated in the other genera. 



MetaSTERNUM, prolonged in front separating the middle coxfc, in 

 Hi/pocj/ptus ; not prolonged between the coxne in all other genera. 

 Posterior margin more or less sinuate, rectilinearly truncate in Ana- 

 C7/ptUS, (fig. 3). 



Posterior cox^li;, free in all the genera except Irichopxem'us, (fig. 

 2), in which they are connate with the metasternuui, form variable, 

 usually with a broad expansion concealing the first and purt of the 

 second abdominal segments, which is parallel or narrowed externally; 

 articular plate small not concealing the trochanter, rarely Aiuin/ptus 

 large, concealing the trochanter and part of the femur. In Ilahro- 

 cerus the posterior coxae consist of the triangular plate merely which 

 conceals the trochanter, (fig. 30). 



Posterior trochanter, moderately long, usually truncate at tip, 

 rarely broadly oval, TrichopHeniuf!, (fig. 2). 



Femora, with several setiform hairs from the lower margin at apex 

 frequently absent from the anterior and posterior and entirely wanting 

 in the ilypocypti. 



TiBl.B usually spinulose, except in Iljjporijptus and Anan/pfiti^, the 

 anterior tibiae of Coiiosoma not spinulose but margined with very 

 short closely placed setae. Tibiae at tip fimbriate with unequal spin- 

 ules except in Cono^omn^ Brijoporua and some Mtjretoporas in which 

 the spinules are short, ecjual and closely placed. • Terminal spurs two 

 in number except in Conosonui where there appears to be one only on 

 the anterior and posterior pairs and two to the middle pair except in 

 two species where one only occurs. 



Tahsi, five-jointed, in the Ilypocypti four-jointed. 



/Ml of the special characters mentioned above receive greater men- 

 tion under the genera in which they occur, one however requires 

 extended notice here. , 



Under the side of the head in the Bolitobii, (fig. 31), may be seen 

 a distinct groove litnited beneath by a ridge which starts at the sides 

 of the buccal opening directly opposite and continuous with the lower 



