264 ME. E. m'lachlan's revision op 



a greenish interruption towards their bases ; costal veinlets befoi'e the 

 pterostigma for the most part simple, apical marginal veinlets mostly 

 simply furcate : posterior wings narrower than the anterior ; all the 

 veins and veinlets greenish, the apical marginal furcations, the base of 

 the costal veinlets, the apex of those between the radius and its sector, 

 and those in the pterostigmatical region black. Legs greyish with a 

 greenish tinge, pilose, the claws tipped with brown. Abdomen yellow, 

 obscurely spotted with blackish at the sides, slender, the terminal 

 segment bearing large appendices. From the superior surface of the 

 last segment proceeds a broad yellow plate thickly clothed with strong 

 yellow hairs; this plate is somewhat bent under, and from each 

 lateral margin proceeds a finger-shaped greenish yellow appendice, 

 which is deeply furcate, the branches widely divaricating, and with a 

 small tubercle or tooth in the base of the fork ; the ventral segment 

 is also produced into a large plate, on each side of which is a nearly 

 straight cylindrical process directed upwards, nearly transparent, but 

 green at the apex, which is deeply divided, so that it appears to end 

 in two sharp brownish teeth ; the ventral plate bears in the middle an 

 elongate, rectangular, truncated, cover-like piece, placed in the cavity 

 between the dorsal and ventral plates and united to the latter. 

 M. osonyloides, Brauer, the typical species, is distinguished by- 

 its very broad wings, rounded costa, and broad costal and marginal 

 areas. M. sejunctus agrees with it in all important characters, 

 save the shape of the wings, which is only specific. I may re- 

 mark that the example of osmyloides in my collection bears the 

 locality -label "China;" but this is probably an error, which is 

 additionally likely, considering that I have two species from 

 Australia. 



Although Myiodactylus differs in many important characters 

 from that noble insect Nymphes myrmeleonides, yet the filiform 

 antennae, and the absence of ocelli, seem fully to justify Brauer in 

 placing it with that insect in the family NymjpMdcB, instituted by 

 Leach for the reception of N. myrmeleonides, which in its nerval 

 characters nearly approaches the MyrmeleonidcB. 



Another species of Myiodactylus I describe as under : — 



Myiodactylus armatus, n. sp. Viridi-flavus. Antennae pallide 

 flavse, viridi terminatse. Caput flavum ; vertice corrugato, postice 

 elevato. Palpi fuliginoso cingulati. Oculi plumbacei. Prothorax 

 longior quam latior, antice vix angustior, postice spatio magno 

 concavo linea elevata longitudinali instructus ; flavus, utrinque lineis 

 obscure fuscis. Alae elongatae, subangustatae, acutae, anticarum costa 

 vix arcuata ; hyalinae, pterostigmate albido : anticae macula parva 

 radii basi nigra, venis longitudinalibus albidis, venulis transversalibus 

 fui'cisque marginalibns fere onmino nigris : posticse venis venulisque 



