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 ami 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 (nQl).—rosiratus, Fb. ; Fhi. ; 

 Mg. ; Mq.; Ztt. iEneo-ciuereus, hypostomate aureo-viridi ;^<7/(/m«wo, 

 ore antennisque nigris, thorace vittis tribus cu])reo-fuscis, alis hyalinis, 

 halteribus albis, pedibus ierrugiueis. Long. If; alar. 4 liu. 



Brassy-einereous. Hypodoma hr'ujld f/olden-greeu, sometimes chaly- 

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

 Antennce quite black ; third joint oval. Thorax loith three bright 

 coppery -br 01071 stripes, slightly pubescent beneath. Wings hyaline. Hal- 

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



Rare. (E.) 



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

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

 thorace vittis tribus asueo-fuscis, alis hyalinis, vena transversa discal i 

 elongata ad marginem interiorem subretracto, halteribus albis ; 3Ias. 

 hypopygio magno, crasso. Long. 1^ ; 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 pra?brachial 

 veins approximating towards the tip ; transverse discal veins rather 

 long, inclining towards the interior margin ; pobrachial veiu incHning 

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

 tain ; axillary aluhe 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, sinning, with brown filiform appendages at the tip. 



Not rare. (E.) 



3. truncorum, Mg. zw. iv. 67. 15 (1834); Mcp ; Ztt. ^Eueo- 

 cinereus, hypostomate ceneo latei'ibv^ virescenti-pruinoso inferne viridi 

 aut cganeo, ore nigro exserto, autennis nigris, thorace vittis tribus i«neo- 

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

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

 Long. 1 J ; alar. 2\ Ihi. 



Brassy-cinereous, rather smaller and darker than the preceding 

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

 yellowish, hoary on oacli side, green or blue below, ('rown bristly. 



