1963] 
MacLeod — Sympherobius 
67 
Female abdomen of the usual type for Sympherobius with the sub- 
genitale only slightly bifurcate posteriorly and with the small stylus 
of the gonopophysis lateralis twice as long as broad. 
S. arizonicus clearly belongs to what Gurney (1948) has termed 
the per parvus group of Nearctic species which also includes S. per- 
parvus (McLachlan), S. killingtoni Carpenter and S. beameri Gurney 
and which are all characterized by the presence of a single spine on 
the ectoproct and a close similarity in the form of the gonarcus and 
parameres. S. arizonicus differs from all of these in that the spine 
of the ectoproct is nearly straight and arises from a small linear basal 
plate from which the spine proceeds directly posteriorly rather than 
first arching dorsally. In addition, the other three species of this group 
have a rather triangular outline to the lateral wings of the gonarcus 
when seen in lateral view, while S. arizonicus has the wings of the 
gonarcus produced ventrally at the anterior end only and is abruptly 
narrowed posteriorly. The parameres of S. arizonicus are somewhat 
intermediate between S. killingtoni and S. perparvus, but lack the 
conspicuous tooth of the fused portion visible in lateral view. Gurney’s 
Plates II and III should be consulted for a summary of these char- 
acters as found in the other three species of the perparvus group . 
In terms of non-genitalic characters, the key of Carpenter (1940) 
will suffice for the proper identification of the males of S. arizonicus 
as the distinctive pattern of wing maculation is quite different from 
any of our other species, although coming closest to the maculation 
pattern of S. killingtoni. 
Literature Cited 
Carpenter, F. M. 
1940. A revision of the Nearctic Hemerobiidae, Berothidae, Sisyridae, 
Polystoechotidae and Dilaridae (Neuroptera ) . Proc. Amer. Acad. 
Arts Sci., 74: 183-280. 
Gurney, A. B. 
1948. Notes on Nearctic Hemerobiidae, with descriptions of two new 
species (Neuroptera). Ann. Ent. Soc. Amer., 41:213-222. 
Nakahara, W. 
1960. Systematic studies on the Hemerobiidae. Mushi, 34: 1-69. 
Tjeder, B. 
1954 Genital structures and terminology in the order Neuroptera. Ent. 
Medd., 27: 23-40, 
Explanation of Plate 6 
Sympherobius arizonicus Banks, $ terminalia. Fig. 1, lateral aspect of tip 
of abdomen. Figs. 2 and 3, postero-dorsal and dorsal aspects of tip of abdo- 
men. Figs. 4 and 5, dorsal and lateral views of gonarcus. Fig. 6, dorsal view 
of ninth sternite with parameres within. Fig. 7, lateral view of parameres. 
Scale for all figu res as indicated. 
Abbreviations: ar, arcessus; epr, ectoproct; gs, gonarcus; pa, parameres 
VII-IX, abdominal segments seven-nine. 
