MEDETERUS. 219 



becomes longer, while the subapical and cubital veins are parallel, and 

 the discal transverse vein is very distant from the hind margin of the 

 wing. 



The typical species of this genus frequent dry places, running 

 in the sunshine on walls and trunks of trees, with a peculiar gait, 

 the legs being nearly erect and the fore part of the body elevated, 

 while they move with seemingly equal ease in any direction 

 without turning. The bulky proboscis opens into a very large 

 orifice, so as to admit a prey large in proportion. 



1. diadema, L. s. n. xii. 982. 19 (llQl^rostratm, Fb. ; Fin. ; 

 Mg. ; Mq. ; Ztt. zEneo-cinereus, hypostomate aureo-viridi nitidissimo, 

 ore antennisque nigris, thorace vittis tribus cupreo-fuscis, alis hyalinis, 

 halteribus albis, pedibus ferrugineis. Long. If ; alar. 4 lin. 



Brassy-cinereous. Hypostoma bright golden-green, sometimes chaly- 

 beous below, naked, with a snow-white transverse suture in the middle. 

 Antenna quite Hack ; third joint- oval. Thorax with three bright 

 coppery-brown stripes, slightly pubescent beneath. Wings hyaline. Hal- 

 teres white. Legs ferruginous ; femora and tarsi more or less brown. 



Eare. (E.) 



2. jaculus, Fin. dol. 5. 7 (1823); Mg. ; Mq. ; Ztt. zEneo- 

 cinereus, hypostomate virescenti-cano, ore nigro exserto, antennis nigris, 

 thorace vittis tribus aeneo-fuscis, alis hyalinis, vena transversa discali 

 elongata ad marginem interiorem subretracto, halteribus albis ; Mas. 

 hypopygio magno, crasso. Long. 1J- ; alar. 3 lin. 



Brassy-cinereous. Hypostoma hoary green, broad. Crown bristly. 

 Mouth large, prominent, black. Thorax with three brassy-brown stripes, 

 slightly hairy on each side. Wings hyaline ; cubital and prasbrachial 

 veins approximating towards the tip; transverse discal veins rather 

 long, inclining towards the interior margin ; pobrachial vein inclining 

 beyond the transverse vein to the hind border, which it does not at- 

 tain ; axillary alula3 and halteres whitish. Legs cinereous-black, some- 

 times brown or ferruginous, naked, unarmed ; knees ferruginous ; hind 

 femora pubescent on the outer side. Male. Hypopygium large, long, 

 inflected, black, shining, with brown filiform appendages at the tip. 



Not rare. (E.) 



3. truncorum, Mg. zw. iv. 67. 15 (1824); Mq.; Ztt. zEneo- 

 cmereus, hypostomate ceneo lateribus virescenti-pruinoso inferne viridi 

 aut cyaneo, ore nigro exserto, anteunis nigris, thorace vittis tribus a3neo- 

 fuscis, alis hyalinis, vena transversa discali elongata ad marginem in- 

 teriorem subretracta, halteribus albis ; Mas. hypopygio modice crasso. 

 Long. 11 ; alar. 2 lin. 



Brassy-cinereous, rather smaller and darker than the preceding 

 species, which it much resembles. Hypostoma rather narrow, brassy, 

 yellowish, hoary on each side, green or blue below. Crown bristly, 



