36 YORKSHIRE NATURALISTS' UNION. 



Hydroporus decoratus Gyll. One of the many rarities 

 found in Askham Bog, where it sometimes swarms in the 

 spring. The earUest date at which I have taken it is March 

 9th. In April it is in profusion, but becomes scarcer in 

 May. A second brood usually appears in autumn, and is 

 met with freely about September 12th. This beautiful 

 insect occurs in several of the ponds, but most profusely 

 in a shallow moss-grown swamp, over-grown with Iris and 

 Typha. Though most abundant in spring and autumn, a 

 few specimens may be obtained in almost any month in the 

 year (rather an unusual circumstance in the case of the 

 Hydradephaga) especially when heavy rains have produced 

 a flooding of the low ground. 



4. Central. — Askham Bog, 1834, taken by G. A. 

 Wright, from shallow puddles in the over-flowed part of the 

 bog, July [Curtis, B. Eiit., 1835, xii. 531). N.B. — The 

 remark about its being confined to such parts of the bog is 

 quite groundless. References to its capture at Askham 

 Bog may also be found in Steph., III., March 31st, 1835, 

 V. 391 {Rev. J. D.J. Preston); Zool., 1855, xiii. 4857 {Rev. 

 Hatnlet Clark); Newmanh Ent., October, 1842, i. 400 

 {R. Cook); Zool., 1857, XV. 541 1 {Wm. Hey, November 

 4th, 1856); E. M. M., June 1872, ix. 12 {H. Hutchinson, 

 April, 1872) ; Friends' Nat. H. /., October 15th, 1880, iv. 

 117 {W.C.H.). 



5. S.W. — Pontefract, April 2nd, 1877 ; named by H. 

 Crowther {Nat., 1877, ii. 160). This must surely be wrong. 



Hydroporus picipes F {^impresso-pundatus Schall.). Very 

 local and scarce. 



2. N.E. — Coatham Marsh, a single example taken in 

 March 1887 (fF.C.^.). 



4. Central. — Askham Bog, a single example taken in 

 1856 (TK Hey). 

 Hydroporus geminus F. There is only one Yorkshire 

 record for this southern species. 



Trans.Y.N.U., 1885 (pub. 1888). Series D. Vol. 3. 



