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tergum 9; dorsal margin tergum 9 projected caudad (Fig. IB). Tergum 10 
convex from dorsal aspect, lateral margins parallel, row of erect setae pres¬ 
ent on dorsolateral margins, apex minutely emarginate in holotype, not in 
paratype. Clasper base elongate, dorsal margin crenulated, arcuate, apex 
obtuse; mesobasal lobe, ventral aspect (Fig. 1C), long, truncate apex bearing 
dense, brownish spicules, apex and mesal margins dark brown. Phallus 
curved ventrocaudad, phallobase enlarged, apex only slightly enlarged, dis¬ 
tal margin semimembranous; viewed laterally a brown pigmented internal 
sclerite discernible (Fig. 1); phallus normally reposes in concave tergum 10. 
Female .—Length 6 mm. General color and structure similar to male. 
Mesh-like reticulation present on most of sterna 3-4, sterna 3-6 densely 
setose; cephalic margins sterna 3, 4 dark brown; sternum 5 brown, margins 
dark brown; sternum 6 cephalic margin brown, narrow excision, mesal lobe 
subacute, projected beyond margin (Fig. ID); from lateral aspect (Fig. IE) 
mesal lobe directed caudad, acuminate; sternum 9 cephalic margin dark 
brown; tergum 7 cephalic margin with deep narrow excision. Lateral aspect, 
sterna 3-6 caudal margin produced ventrad, dense setation (Fig. IF). Bursa 
copulatrix from ventral aspect as in Fig. 1G. 
Holotype. —Male, El Salvador: La Liberatad, light trap, west bank Rio 
Chilama, 20 February 1969, Larry L. Lewallen. Allotype. Female (dam¬ 
aged), same data as for holotype. Paratype. Male, same data as for holotype. 
Types to be deposited in Academy of Sciences, Golden Gate Park, San 
Francisco, California. 
This species named in honor of the collector, Larry L. Lewallen, State 
Department of Health, Fresno, California. 
Helicopsyche villegasi, new species 
Related to planata Ross, differing from it and others as follows: sharply 
curved apex of claspers directed ventral, narrow mesobasal lobe of clasper; 
sharply declivent tergum 10; distally enlarged phallus. 
Figs. 1-6. Fig. 1. Helicopsyche lewalleni, male genitalia, lateral. 1A, mesal lobe sternum 
6, ventral aspect; IB, tergum 9, 10, dorsal aspect; 1C, clasper mesobasal lobe, ventral view; 
ID, female, sternum 6, ventral aspect; IE, female, sternum 6, lateral view; IF, female, sternum 
5, lateral; 1G, bursa copulatrix, ventral. Fig. 2. Helicopsyche villegasi, male genitalia, lateral; 
2A mesal lobe sternum 6, ventral; 2B, clasper, mesobasal lobe, ventral. Fig. 3. Helicopsyche 
femora, male genitalia, lateral; 3A mesal lobe sternum 6, ventral; 3B, mesal lobe sternum 6, 
lateral; 3C, tergum 10, dorsal; 3D, clasper, mesobasal lobe, ventral. Fig. 4. Helicopsyche 
rentzi, male genitalia, lateral. 4A, mesal lobe sternum 6; 4B, clasper, mesobasal lobe, ventral; 
4C female, sternum 6, ventral; 4D, female, bursa copulatrix, ventral. Fig. 5. Helicopsyche 
sinuata, male genitalia, lateral; 5A, clasper, mesobasal lobe, ventral. Fig. 6. Helicopsyche 
mexicanci, male, mesal lobe, sternum 6, ventral; 6A, female, bursa copulatrix, ventral. 
