NEMATUS HISTBIO. . 91 



This group lias great resemblance to caprece, but 

 the ground colour of the thorax has a darker reddish 

 tinge, the stigma is more livid, the body longer, 

 antennge shorter, stouter. In having black markings 

 on the thorax in most of the species, and in all of them 

 being very variable, both groups agree. The elongated 

 abdomen of histrio and glenelgensis gives a different 

 facies to them compared to caprece, and the abdomen 

 also is not broadly black along the back, but only at the 

 base, or slightly marked with black along the middle. 

 Hcemorrhoidalis, however, has pretty much the same 

 body-form as caprece, and it has the belly greenish- 

 white when fresh, but acquires a brownish tinge with 

 age. The two groups, in fact, might be united. 



The males have either the body entirely black 

 except the ventral surface, as in glenelgensis and 

 hcemorrhoidalis, or the abdomen is fulvous in the middle 

 as in his trio. 



Synopsis of Species. 



1 (2) Body for the greater part black, abdominal segments at the 



apex lined with livid white, stigma fuscous. Humeralis. 



2 (1) Body for the greater part reddish-yellow, stigma livid white. 



3 (4) Abdomen for the greater part black above, thickish, bulging 



out in the middle. Longiserra, hcemorrhoidalis. 



4 (3) Abdomen longish, contracted and narrowed towards the apex, 



black at base and apex. 



5 (6) Colour light reddish -yellow, legs for the greater part testaceous. 



Length 4f lines. Histrio. 



6 (5) Colour dark reddish-brown, legs for the greater part black. 



Length 3 lines. Glenelgensis. 



31. NEMATUS HISTEIO. 

 PL II, fig. 6, ? ; PL XVIII, fig. 4, Saw. 



Nematus histrio, Lep., F. Fr., 65, 7 ; Mon., 63, 185 ; Br. and 

 Zad., Schr. Ges. Konig., xvi, 68, 15, 

 pi. 4, fig. 10 ; Cam., E. M. M., xi, 65 ; 

 Fauna, 30, 4; Andre, Species, i, 105, 

 Cat., 13,* 11. 



rufescens, Htg., Blattw., 191, 15 ; Ratz., Forstins., iii, 

 126 ; Thorns., Hym. Scand., i, 130, 56. 



