SIREX. 



web of a whitifh colour. The chryfalis is of a lengthened 

 fhape, with the antenna, legs, and terminal tube or procefs, 

 very diftinclly charafterized. If the change to chryfalis 

 takes place, as it fometimes does, in fummer, the fly pro- 

 ceeds from it in the fpace of about three weeks ; but if at 

 the clofe of autumn, the animal continues a chryfalis the 

 whole winter, emerging in the following fpring. The male 

 infedl is confiderably fmaller than the female, and may be 

 farther diftinguifhed by the want of the caudal tube or pro- 

 cefs, fo confpicuous in the female infeft : the tip of the ab- 

 domen is alfo of a black colour. The eggs, which are de- 

 pofited by the female in the decayed parts of the trees al- 

 ready mentioned, are very fmall, and of a lengtUened oval 

 fhape, with pointed extremities. 



PsYLLiirs. Abdomen yellow at the bafe and before the 

 tip ; the body is black. It inhabits different European 

 countries, and is half the fize of the laft. The antennae and 

 legs are yellow, and the thighs black ; the head is black, 

 with a yellow fpot on each fide, behind the eyes ; certain 

 fegments of the abdomen yellow. 



CoLUMBA. This is an American fpecies, and is diftin- 

 guifhed by its black body, marked by teftaceous bands. 

 The fpecific charafter is as follows : thorax villous, ferru- 

 ginous ; abdomen black, the fides are fpotted with yellow ; 

 the antennae are fhort and black, ferruginous at the bafe ; the 

 abdomen beneath is black, with a yellow ftreak ; the projec- 

 tion is fhort, acute, ferrate, yellow tipped with black ; the 

 legs are yellow ; hind-thighs black. 



Magus. Black, thorax villous ; tip of the antenna, la- 

 teral fpots on the abdomen, (lianks, and bafe of the tarfi, 

 are white. It is of the fize of the S. gigas, and is found in 

 many parts of Saxony. The abdomen beneath is white in 

 the middle ; the wings are dufl<y. 



NiGRicoRNis. Thorax villous, blueifh-black ; abdomen 

 ferruginous, blue at the bafe. It is found in North Ame- 

 rica. The head is ftiining blue-black ; the antennx are 

 black ; the legs are piceous ; thighs yellow ; iting pitchy. 

 Flavicornis. Thorax villous, black, immaculate ; four 

 bands on the abdomen, antenns, and legs, yellow. It is 

 found at Labrador, in America. The head is black ; the 

 upper part of fome of the fegments is yellow ; the ap- 

 pendage ferrate, yellow ; the fting is black. 



Fu.scicoRNls. Thorax villous, black ; abdomen with 

 eight yellow bands ; the antennae are black ; the legs are 

 yellow. This, which is of the fize of the gigas, inhabits 

 Saxony. The wings are fubteftaceous ; the lling is black, 

 with a yellow Iheath ; the horn of the abdomen is fubulate, 

 yellow tipt with black ; the thighs are black. 



* Spectrum. The abdomen of this fpecies is black ; the 

 thorax is villous, with a yellow ftripe before the wings. It 

 is found in this country, and in many other parts of Eu- 

 rope. The antennae are black or yellow, and the legs are 

 yellow. 



*JuvEMCUS. The abdomen is blueifh-black ; the thorax 

 villous, immaculate. This alfo is a native of England and 

 other European countries. The antenna are black or yel- 

 low ; the legs are yellow. 



PhantOMA. Abdomen above yellow, with black belts ; 

 the head and legs are yellow. It inhabits Germany. The 

 mouth is black ; the thorax yellowifh before, beneath black ; 

 the abdomen beneath is black. 



Cyanus. This is of a ftiining blue colour ; the legs are 

 yellow. It inhabits North America. The antenna: are 

 black ; the thorax fubvillous ; the wings are hyaline. 



Albicornis- Black ; head with a white fpot on each 

 fide ; the antennae are white in the middle. It is a native of 

 North America. The antennae are black at the tip ; the 



abdomen with a white dot on each fide on the laft fegmeit 

 but one ; the legs are black ; the ftianks and ends of the 

 tarfi are white. 



NiGRiTA. This is of a black-blue, immaculate; the himl 

 leg! arc comprell'ed. It is a native of Saxony, and is of 

 the fame fize as the S. marifcus, hereafter to be noticed. 



* Camelu;;. The abdomen is black, the fides fpotted 

 with white ; the thorax fmooth. This is found in England 

 and other European countries. 



Emarci.n'atus. Black j thorax emarginatc before, and 

 pale at the fides ; the fore-legs are rufous. It inhabits Ger- 

 many. The antennas are black ; the head is black, with a 

 pale fpot on each fide : the fides of the thorax are flightly 

 ferrate. The four front legs are rufous ; the ftianks are tipt 

 with black ; the hind ones are black ; the thighs rufous. 



Di'.OMEDARius. Abdomen black, rufous in the middle, 

 with a white dot on each fide. The ftianks are pale at the 

 bafe. It is chiefly found at Kiel, and refembles the S. camelus. 

 The head is black, with two white lines ; the thorax is 

 black, vi-ith a white dot before the wings ; fome of the feg- 

 ments of the abdomen are black, fome rufous, one black, 

 with a white fpot on each fide, and one is altogether 

 black. 



Pacca. Abdomen black, two of the fegments are rufous, 

 the reft dotted with white. This alfo is found at Kiel, and 

 is the fize of the S. camelus. The antenna are black, a 

 little thicker towards the tip ; the thorax is villous aiidblack, 

 with two minute white fpots on the fore margin ; the horn 

 of the abdomen yellowifti, iting rufous ; legs comprefled, 

 black. 



SiMiLie. Black ; firft fegment of the abdomen at the 

 bafe and fecond rufous, the reft with five yellow fpots. It 

 inhabits the Cape of Good Hope. The head is black ; the 

 orbits yellow ; antennx ferruginous ; the bafe and tip black ; 

 the thorax black, with a yellow dot on each fide ; the legs 

 are rufous, the thighs black ; the tail is pointed, without any 

 projeftion. 



Vespertilio. Black ; abdomen ferruginous, the bafe 

 is black. This is a fmall infeA, and is found in divers parts 

 of Germany. The antennae are black, with a whitifti ring ; 

 the tail is black beneath, without the appendage ; the upper 

 wings are white, with a broad brown patch before the tip, 

 and white marginal dots ; the legs are black, tip of the 

 thighs and bafe of the ftianks white. 



Mariscus. Of this ipecies the abdomen is teftaceous, 

 the two laft fegments are black ; the thorax villous. This is 

 found in divers parts of Europe. Antennae yellow ; head 

 with a yellow callous dot behind the eyes ; the abdomen be- 

 neath is black, fpotted with yellow ; it has no fting. 



Troglodyta. Smooth, black ; abdomen with feven 

 yellow dots, and two bands. It inhabits Saxony. The legs 

 are yellow ; the thighs black. 



NocTiLiA. This is of a black-blue colour ; the antennae 

 are black ; the thorax is villous ; the abdomen teftaceous in 

 the middle. It inhabits feveral parts of Germany, and is 

 about the fize of the S. marifcus. Thorax blue ; abdomen 

 blue at the bafe and tip ; wings yellowifti ; legs yellow ; 

 hind ones comprefled, black, the thighs yellow. 



Compressa. Black ; abdomen comprefled, ferruginous ; 

 the firft and laft fegments are black. It inhabits Barbary, 

 and is very fmall. Legs white ; thighs black ; hind ones 

 black ; the ftianks are comprefled, black, with two yellow 

 dots, and three bands. 



* Pygm.i;us. Abdomen comprefled, black, with two yel- 

 low dots and three bands. It is a native of this country, and 

 of other parts of Europe. This is one of the fmalleft of 

 the European fpecies, being, according to Linnaeus, about 



the 



