102 Eev. T. A. Marshall's monograph of 



Differs from circuinscriptus in the proportions of the 

 1st abdominal segment, and the number of joints in the 

 antenna3. The abdominal segments 1 — 3 are very 

 minutely striolated, not shining. 



A male and two females of this new British species, 

 in fine condition, nre in Fitch's collection. Hitherto 

 taken in Belgium, Austria, and Switzerland. 



II. CEYPTOGASTEES. 



X. SIGALPHIDES. 

 Clypeus entire ; mouth closed ; maxillary jDalpi C-, labial 4-jointecl ; 

 occiput margined. Abdomen broadly sessile ; segments 1 — 3 con- 

 nate above, forming a carapace, usually with two superficial, 

 crenulate sutures ; the remaining segments concealed, or (i 

 Allodorus) very briefly exserted. Two cubital areolets ; recurrent 

 nervure rejected ; radial areolet ovate, acuminate, not reaching 

 the apex of the wing ; pra?- and pobrachial areolets subequal. 

 Terebra elongate. 



The original genus Suialphns, Latr. (1802) included 

 the subfamilies Sigalphides, Chelonides, and CaltqMdes. 

 The Chelonides were separated in 1807 by Jurine. Nees 

 von Esenbecli, in 1834, divided Sifialplms into two 

 sections, the 1st comprising the Sigalphides proper (with 

 a mixture of Calgptus) ; the 2d containing two species 

 now referred to the Algsiides. Haliday, in 1835, gave 

 the name Triaspis to Von Esenbeck's first section, dis- 

 tinguishing Calyptus ; and in the same year Wesmael 

 independently established the same divisions, but under 

 the names Sigalphus and Brachistes. Finally, the 

 appropriate creation of the genus Allodorus by Forster, 

 in 1862, reduces Sigalplius to its lowest terms. The 

 Si<i((lpJiidt's and Chelonides are nearly connected by their 

 abdominal structure, although differing in the wings and 

 terebra. They formed together the group Criiptogastres 

 of Wesmael, which, as represented in Europe, is entirely 

 isolated, though some of the exotic genera [Spinaria, 

 Fornicia) exhibit a certain affinity to the Braeon type. 



The two British genera may be thus distinguished : — 



Segments 4 — 5 not entirely concealed under the cara- 

 pace ; the 2cl longer than the Hd ; axillary aieolet 

 bisected before tlie apex by a transverse nervure i. Allodorus. 



Segments 4 — 5 entirely concealed; the 2d shorter 



than the 3d ; axillary areolet undivided . . ii. Sigalphus. 



