218 ENTOMOLOGY FOR MEDICAL OFFICERS 



be seen to be full of the fowl's blood, so that this supposition may be not 

 quite correct. For this reason — although these insects are not known to 

 trouble man — it is just as well that the medical officer should be able to 

 distinguish the different genera. The following table of genera is taken 

 from Kellogg {Psyche, 1896, p. 375). 



Synopsis of Mallophaga. 



1. Antennse filiform, with 3 or 5 segments ; no labial palps 



ISCHNOCERA. 



2. Antennas clavate or capitate, with 4 segments ; labial palps 4- 



segmented Amblycera, 



I. ISCHNOCERA. 



a. Antennae with 3 segments ; tarsi with one claw ; parasitic on 



mammals = Trichodectida, with one genus Trichodectes. 



b. Antennae with 5 segments ; tarsi with two claws ; parasitic on 



birds Philopterida. 



Philopterid^. 



Antennae similar in both sexes i. 



Antennas differing in the two sexes ii. 



r Front deeply angularly notched Acidoproctus. 



i. \ Front convex, truncate, rarely emarginate but never angularly 



I notched 3. 



("Elongate narrow species, with very small or no trabeculae at the 



3. -j anterior angle of the antennal fossa Nirmus. 



iBroad short species, with large movable trabeculae 4. 



(Forehead with a broad transverse, membranous flap projecting 

 beyond the lateral margin of the head in the male, barely pro- 

 jecting in the female Giebelia. 

 Forehead without such membranous flap Docophorus. 

 ■ ■ /Broad species, elongate-oval to suborbicular 5. 

 I Narrow elongate species with sides subparallel vi. 



(Temporal margins rounded; last segment of abdomen roundly 

 emarginate ; antennae of male without appendage, the 3rd 

 segment very long Eurymetopus. 



Temporal margins usually angulate ; last segment of abdomen 

 convex, rarely angularly emarginate with tv/o points 7. 



-First segment of antennae of male large, sometimes with an 

 appendage, 3rd segment always with an appendage 



Goniodes. 

 First segment of antennae of male enlarged but always without an 

 appendage, 3rd segment without appendage ; last segment of 

 (. abdomen rounded behind • Goniocotes. 



/-Third segment of antenna of male without an appendage 

 j Ornithobius. 



I Third segment of antenna of male with an appendage 8. 



