PORRITT : NEUROPTERA AND TRICHOPTERA OF YORKSHIRE. IIQ 
the whitish-hyaline form seems to occur. Until I found this 
form at Sledmere it had scarcely been observed in Britain, but 
Mr. C. A. Briggs has since found it in Surrey. It is well worthy 
of a varietal name. 
CHRYSOPID. 
Chrysopa flava. Abundant probably everywhere. Huddersfield ; 
Doncaster; Castle Howard ; Saltburn. 
Chrysopa vittata. Closely allied to C. fava, but not nearly so 
ommon. Huddersfield; Bishop’s Wood, Selby; Sandburn, 
York ; Castle Howard. 
Chrysopa alba. Very common on the east side of the county, 
scarcer on the west side. Huddersfield ; Doncaster; Selby ; 
Castle Howard. 
Chrysopa flavifrons. Green Farm Wood, Doncaster; Sandburn ; 
York ; Castle Howard. 
Chrysopa tenella. This small species, formerly considered very 
rare in Britain, seems to occur all over our county, and is not 
uncommon even in my own garden. Huddersfield; Wharncliffe 
Woods, common; Askham Bogs, York ; Bishop’s Wood, Selby; 
Thorne ; Castle Howard ; Saltburn. 
Chrysopa vulgaris. This, which ough? to be common, seems to 
be our rarest species. I have searched closely for it, but the 
only Yorkshire specimen I have ever taken was on the hill 
behind my house, beaten out of a sallow bush on June 12th, 
1894. 
Chrysopa aspersa. Sandburn, York; Thorne, near Goole. 
Chrysopa ventralis. I have a very strong opinion that this is 
only a variety of C. asfersa, from which it only differs in having 
the underside of the abdomen black. Whenever I have found 
one common, the other has, I think, always occurred with it, 
and although I have only taken a few specimens in all in our 
own county (including both forms), the rule holds good at 
Sandburn, the only place where I have taken more than odd 
specimens. Sandburn, York ; Green Farm Wood, Doncaster. 
Chrysopa phyllochroma. A beautiful specimen on Thorne 
Moor, July 18th, 1891, is the only example I have yet seen. 
Chrysopa perla. This d/we-winged species (all the rest of the 
genus have green wings of various shades) is very common In 
many of our woods. Wharncliffe Woods ; Dodworth; Green 
Farm Wood, Doncaster; Bishop’s Wood, Selby; Sandburn, 
York. 
April 1897, 
