362 T. U. A. Cocherell — Arthropods in Burmese Amber. 



begins, but 400 of this is antenna, at least) ; second antennal 

 joint, 750 ; third, 576 ; fourth, 480 ; width of thorax about 

 496 ; eyes to end of rostrum about 960 ; width of abdomen 

 about 1070 ; anterior legs with long claw 192, short 128 ; 

 length of middle tibia, 960; middle tarsus, 336 ; width of hind 

 femur 208. The claws of middle legs are ordinary, slender 

 and simple. It is assumed that the antennae are four-jointed, 

 but the region at base is obscured, and there may be a small 

 basal joint. 



Burmese amber, from R. C. J. Swinhoe. In the same slab 

 as the type of Cryphalites, and 22""" from it. I at first thought 

 this singular insect must be a Reduviid, but although the 

 wings are not developed, the structure indicates the primitive 

 family Enicocephalidse. Owing to the inclusion of air, the 

 details of the dorsal surface cannot be clearly made out. 

 Plithirocoris Enderlein, from the Crozet Is., is apterous, but 

 is in other respects very different. 



The following key separates the principal genera of this 

 group : 



Wings not developed; anterior tarsi with two claws 1 



Wings developed 2 



1. Antennae very short and stout; rostrum short and stout; 



middle and hind legs with 1 -jointed tarsi 



_- Phthirocoris Enderlein 



Antennae very long and slender; rostum slender 



Pisphcerocephalus Ckll. 



2. Anterior tarsi with one claw only P?iicoce2?halus Westwood 



Anterior tarsi with two claws 3 



3. Posterior lobe of head transverse; insect strongly pubescent; 



discal cell closed Hymenocoris Uhler 



Posterior lobe of head elongate; insect little pubescent 



. - _ ______ _ _ . )Steno2nrates Walker 



Enderlein also distinguishes two other genera. Sphigmo- 

 cephalus Enderlein, from Africa, is separated from Enico- 

 cephaliis by the middle and hind tarsi, which are 2-jointed 

 instead of 3-jointed ; the venation does not differ in any 

 important particular, llensdiiella Horv., from Europe, has 

 the 3-jointed middle and hind tarsi ; but there is only one 

 cross- vein between the media and cubitus. Hymenocoris was 

 based on the Californian II. formicina\]\AQY \ another species 

 is Hymenocoris harhatus {Henicocephahis harhatus Bergr.) from 

 Ceylon. Ilymenodectes Uhler is here considered a synonym of 

 Stenopirates ; but Van Dnzee, in his recent Check List, places 

 it to^jjether with Ilenschiella^ under Systelloderus JBlanch. 

 Various arrangements are possible, according to the emphasis 

 placed on the venation, form of head and thorax, or the 



