MALLOPHAGA. 555 



tinct jaws. The flattened body is corneous, hard above, and 

 the head is horizontal, with three to five-jointed antennai ; the 

 eyes are small and simple ; the mandibles are small, like a 

 hook, and the niaxillary palpi, when present, for they are some- 

 times wanting, are four-jointed, while the labial palpi are two- 

 jointed. The thorax is small and but two-jointed apparently, 

 as the nieso- and metathorax are united together. The abdo- 

 men is from nine to ten-jointed, while the short thick limbs 

 have two-jointed tarsi and one or two claws. 



These insects are considered by Burmeister as forming a 

 passage from the Ilemiptera into the Orthoptera, as they pos- 

 sess free biting mouth-parts, especially free mandibles, which 

 are not as in the rest of the suborder fused together with the 

 other parts to form a sucking tube. Docopliorus buteonis Pack, 

 (pi. 9,* fig. 3) lives on the Red Shouldered Hawk ; and D. 

 hamatus Pack. (PI. 9, fig. 7) is found ou the Snow Bunting. 



Goniocotes Burnettii Pack. (Fig. 560) infests the domestic 

 fowl. Lipeurus corvi Pack. (PL 9, fig. 2) is a parasite of the 

 crow ; L. elongatus Pack. (PI. 9, fig. 

 4), and L. gracilis Pack. (PI. 9, fig. 

 G) are long and slender forms. In 

 the genus Philojyterus of Nitzsch the 

 antennae are filiform, five-jointed, and 

 the labial palpi are wanting. Nir- 

 mus is an allied genus ; both live on 

 birds. N. thoracicus Pack. (PI. 9, 

 fig. 5) lives on the Snow Bunting, 



TricJiodectes canis DeGeer lives on 

 the dog, and has three-jointed an- 

 tennas. The females have two mov- 

 able hooks on the penultimate ring of 

 the abdomen. T. subrostratus is a 



parasite of the cat. T. caprce Pack., lives on the goat. The 

 Saddle-back Gull is inhabited by Colpoceplialmn lari Pack. (PI. 

 0, fig. 1). Gyropus has no labial palpi. G.porcelli Schrank is 

 a third of an inch long and lives on the Porpoise. Mr. C. 

 Cooke has found G. ovalir, on the Guinea pig in this country. 



*Exi LANATiox OF Tlate 9. — Fig. 1, Colpoccphalum lari Tack.; \a, antenna; 

 Fig. 2. JApeuruitcorviVM-^s..; "in, antenna; Fig. 3, Docopliorus buteonis P.ick. ; .Sfr, 

 antenna; V'lg. A, Lipeitrus elongatus 'P.ick. , 4a, antenna; Fig.."), Xirinus thoracicus 

 Pack. ; Fig. C, Lipeurus gracilis Pack. ; Fig. 7, Docopliorus hamatus Pack. 



