neio S-pecies of Exotic Hymenopterous Insects. 227 



Caput nigrum, opacum, sub lente striolis Isevissirais notatum, 

 impressione semicirculari ante antennas clypeum simulante ; 

 antennae nigrte, articuli 4ti apice, .5to toto, 6to fere toto rufes- 

 centibus. Thorax niger. Collare nigrum compressum, dorso 

 tamen planiusculo linea tenui media longitudinali impressd. 

 Metatliorax supra planiusculus, carinis duabus elevatis 

 utrinque^ dorso lineiscirciter 10 irregularibus longitudinalibus 

 elevatis, striis transversis connexis. Abdomen nigrum elongato- 

 ovale, segmento Imo ad apicem parum constricto nitido ; 2do 

 paullo majori nitido ; 3tio fere requali subopaco ; 4to minori ; 

 .5to minuto ; 6to attenuate acuto rufescenti. Pedes rufo- 

 ' fulvi, tarsorum apicibus paullo obscurioribus. Alae anticae 



fuscae, fascid hyalina transversa ante stigma notatse ; posticae 

 liyalinae, 



Plate XII. fig. 4. Aplielotoma tasmanica, magnified. 



A a, front of head with the labrum removed; Ah, labrum ; 

 4 c, mandible; id, maxilla; 4e, labiiim; 4^, ungues. 



Chlorion, Latr. 



The genus Chlorion was established by Latreille in the third 

 volume of the " Histoire Generale, &c. des Insectes ;" wherein it 

 formed the first genus of the second section of the Sphegimce, 

 characterized by the straight maxillee and tongue (not bent as in 

 the first section of typical Spheges and Ammophilce), the maxillary 

 palpi much longer than the labial, with irregular shaped joints 

 (instead of being regularly shaped, and nearly of equal length 

 with the labial palpi, as in the first section). The only species 

 given as the type of the genus in this volume is the Sphex lohata 

 of Fabricius ; but as the characters of that species do not accord 

 either with the sectional or generic characters of Chlorion, it is 

 necessary to determine what insect Latreille had in view in the 

 establishment of the genus. We accordingly find in the thirteenth 

 volume of the same work, published in 1805, that another species 

 is added as a second type, namely, Sphex compressa of Fabricius — 

 an insect generically distinct from the former, and which agrees 

 with Latreille's characters of Chlorion. The short maxillae and 

 palpi, the pointed tip of the labial palpi, the short tongue, the 

 truncation of the extremity of the thorax, the constricted form 

 of the extremity of the basal segment of the abdomen, the small 

 size of the posterior calcarise, the posterior tibiae and tarsi almost 

 destitute of ciliae or bristles, are all characters of Sphex compressa 



