PHASMID.E. BACTERIA. 



33 



is considerably longer than the anterior portion of the 

 body ; it is gradually widened to the fonrth segment, and is 

 afterwards gradually attenuated to the tip ; the three ter- 

 minal segments together are not longer than the sixth, 

 the seventh being equal to the eightli and ninth united ; 

 the last is furnished with a long narrow apjieudage resem- 

 bling a tenth joint, with its extremity obtusely pointed. 

 The ojiereulum is not at all convex, and extends only to 

 the base of the ninth segment ; the two anal styles are 

 very short and thin, attached on the under side of the 

 ninth joint. Tlie legs are long, very slender, and simple ; 

 the tarsi short, with the basal joint as long as the remainder 

 united. 



I suppose, notwithstanding its length, that the unique 

 specimeu which I have seen is an immature female. 



Plate XXIV. Fig. 11. The female, of the natural size. 11a. 

 The terminal segments of the abdomen seen sideways. 



41.(93.) Bacteria coenosa. 

 Plate XXVI I. tig. 2, male. 

 Flavescenti-brunnea ; thorace scabro, abdominis apice 

 viridi ; operculo flavo ; pedibus longis, hirsutis ; antennis 

 elongatis, articuloruin apicibus nigris. 



Long. corp. 2" 11'"; anten. 1" 10'"; i)roth. 1 i"' ; me- 

 80th. r"; metath. 5'"; abdom. 15"' + 4"'= 19'". 



Foem. Bacteria ccenosa, Hope, MSS. 



G.R.Graij,Ent.ofAustr. i)1.2. f. 2; Sijii.Phasm. p. 18. 

 Mas. Bacteria tenuis, Hope, MSS. 

 Larva juvenis. Bacteria fragilis, Hope, MSS. 



G. R. Gray, Ent. ofAusfr. ])1. 7. f. 1 ; Syn. P/iasm.-p. 18. 



Hab. In Australia. iSIns. Hope. 



The dimensions given above are taken from the typical 

 specimen of B. ccenosa in the Hopean Collection, the figure 

 above referred to being too large and robust. The meso- 

 thorax has on each side two longitudinal rows of small 

 granules. The abdomen is gradually attenuated ; the ter- 

 minal segment with the two minute but rather broad anal 

 styles exposed at its extremity. The operculum extends 

 to the middle of the ninth dorsal segment, having a curved 

 and acute horny detached lobe within. The legs are long 

 and entirely destitute of spines. 



The insect has the appearance of being in an immature 

 condition, the surface of the body having shrunk in various 

 parts. 



A careful examination of the typical specimen of B. fra- 

 gilis has satisfied me that it is only a young larva of the 

 preceding s})ecies. It is represented in the figure above 

 referred to much too large and robust, and with the oper- 

 culum much too developed. It lies in fact quite flat, ex- 



tending not more than the length of one-third of the eighth 

 dorsal segment ; the remainder of the ventral surface of 

 this segment is occupied with two flat oval lateral lobes and 

 a narrow ventral pointed one; and the ninth ventral seg- 

 ment bears two curved and rather broad appendages, and 

 two short exserted lateral anal styles. The mesothorax 

 has the rudiments of the lateral rows of granules. The 

 head is dirty white, but having shrunk in tlie middle, it 

 appears to be marked on each side with a white line. 



Mr. Hope has applied the MS. name of B. tenuis to a 

 small insect in his collection, represented in PI. XXVII. 

 fig. 2, which I have no hesitation in regarding as tlie male 

 of B. cu'iiosa. It is very slender, cylindrical, smooth, dirty 

 brown ; the head above marked with a longitudinal pale 

 line on each side behind the antennae ; the abdominal seg- 

 ments are rather narrowed in the middle, the base and ex- 

 tremity of each being gradually widened. The mesothorax 

 is long, and marked on each side with two rows of small 

 black granules placed wide apart ; the eighth dorsal seg- 

 ment is half as long again as the ninth, which is notched at 

 its extremity, cariuated above, and furnished in the middle 

 beneath with two long, deflexed, curved, obtuse, setose anal 

 styles ; the eighth and ninth ventral segments are swollen, 

 especially the angulated base of the ninth, which does not 

 extend to more than two-thirds of the length of the eighth 

 dorsal segment. The legs are long, very slender, and 

 simple. 



Plate XXVII. Fig. 2. Tlie male, of the natural size. 2 a. 

 The terminal segments of the body seen sideways. 



42. (94.) Bacteria Samouellii. 



Flavo-brunnea ; antennis brevibus, juxta basin canalicu- 

 latis ; capite elongato, cwlato ; thorace prKsertim auteriori 

 tuberculato ; abdomine brevi, apice jiluri-sulcato ; pedibus 

 gracilibus, liueis elevatis striatis. 



Long. Corp. 3" 3'" ; anten. 1" 2'". 



Bacteria Samouellii, G. R. Gray, Syn. Fhasm. p. 43. 

 Eab. ? B.M. 



Obs. The typical specimeu, probably immature, in the 

 National Collection is mutilated, wanting the four fore-legs. 

 The body is very slender, gradually attenuated from the 

 head to the extremity of the abdomen ; the antennse are 

 thickened at the base, with the basal joint depressed, coni- 

 cal, and with several longitudinal caiinse, and gradually 

 setaceous and multi-articulate ; the hind pair of legs are 

 very slender and entirely destitute of spines ; the basal 

 joint of the tarsi is very long ; the three terminal segments 

 of the abdomen are marked with three slender, pale, shghtly 



